Simple 89S Series Programmer
Download Code and Softw...
50 Watt Amplifier Circuit
This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low pass filter at the input, it makes a great amp for a small subwoofer.
Parts List-
R1 - 1 - 200 Ohm 1/4 W Resistor
R2 - 1 - 200K 1/4 W Resistor
R3 - 1 - 30K 1/4 W Resistor
R5 - 1 - 1K 1/4 W Resistor
R6 - 1 - 5K 1/4 W Resistor
R7,R10 - 2 - 1 Meg (5%) 1/2 W Resistor
R8,R9 - 2 - 0.4 Ohm 5 W Resistor
R11 - 1 - 10K Pot
R12,R13 - 2 - 51K 1/4 W Resistor
R14 - 1 - 47K 1/4 W Resistor
C1 -...
Transformerless Power Supply
Parts List-
C1 - 1 - 0.39uF 250V Capacitor
C2 - 1 - 220uF 25V Electrolytic Capacitor
D1 - 1 - 1N4741 11V Zener Diode (See Notes)
BR1 - 1 - 1 Amp 200V Bridge Rectifier
MISC - 1 - Line Cord, Board, Wire, Case
Notes-
1. The value of C1 can be increased to increase the amount of current the circuit can supply. With the values shown, the circuit can supply up to about 15mA. Remember to increase the size of C2 also.
2. <>A different value can be used for D1 to increase or decrease the voltage as needed.
3. Please note that this circuit is not isolated from 120VAC. Because of this, the circuit must be treated with caution and encosed at...
Fixed Voltage Power Supply
Parts List-
C1 - 1 - 2200uF 35V Electrolytic Capacitor
C2, C4 - 2 - 0.1uF Ceramic Disc Capacitor
C3 - 1 - 10uF 35V Electrolytic Capacitor
D1, D2 - 2 - 1N4007 Silicon Diode
BR1 - 1 - 2A 30V Bridge Rectifier
U1 - 1 - Regulator (See Notes)
T1 - 1 - Transformer (See Notes)
S1 - 1 - SPST 2 Amp Switch
F1 - 1 - 2A 250V Fuse and Holder
MISC - 1 - Heatsink For U1, Line Cord, Case, Wire
Notes-
1. Since this project operates from 120 (or 220, or 240, etc.) volts AC, it MUST be built inside a case.
2. U1 will reauire a heatsink.
3. You will need to choose T1 and U1 to match the voltage you want. Use the table below as a reference.
Output Voltage
...
Laser Power Supply
Parts List-
R1 - 1 - 10 Ohm 10W Or Greater Resistor
R2 - 1 - Ballast Resistor, See "Notes"
D1, D2, D3 - 3 - 1N4007 Silicon Diode
C1, C2, C3 - 3 - 0.1 uF 2000V Capacitor
T1 - 1 - 9V 1A Transformer
S1 - 1 - 115V 2A SPST Switch
MISC - 1 - Case, Wire, Binding Posts (for output), Line Cord
Notes-
1. T1 is an ordinary 9V 1A transformer connected backwards for step up.
2. R1 MUST be installed on a LARGE heatsink. A good heatsink is the metal case the supply is built in.
3. R2 Protects the laser tube from excess current. It should be soldered directly to the anode terminal on the tube. To find R2, start with a 500K 10W resistor and work down...
Clap Switch Circuit
The transformer is 220V to 15V -0V-15V transformer of a minimum of 10VA. You can replace the 1N4001 diodes of any types with similar ratings.The relay is 12V with 5A output current capacity or higher. You can replace also the transistor of any general purpose type.
Note: This clap activated relay is connected to main supply (220VAC). Do not try to touch the main supply to avoid electrocution or do not try to construct if you do not have any idea in electroni...
Led emergency light using cellphone battery and charger
Emergency lighting system uses LED and powered by a 3.6V cellphone battery or any battery of the same voltage. The battery is charge by a cellphone charger with a current of 350mA. During the
charging process, transistor Q1 is off so are the LEDs. When the power is cutoff (brownout), transistor is energized an delivers 25mA current to the four LED. The emergency light consumes about 0.5W and a fully charge battery can last up to 5hours.
Parts List
D2, D3, D4, D5- preferably white LEDs
Q1- 9012 or any general purpose pnp transistor
cellphone battery or similar
Battery charger
1000uF /10V capacitor
4.7k and 220 ohms 0.25W resistor
5 ohms 1W...
Simple LED Emergency Light Circuit
Emergency light project is simple, cheap and easy to build. The circuit do the charging of the battery and when the main source is not available such as in brownouts, the white LEDs
automatically turn on.
Initially, the voltage output from 220V to 12V converter is fed to the input of LM317 regulator. Then this voltage is regulated down to 7.37V using 240 ohms and 1.2K resistor combination (see LM317 Calculator). At this instant, the battery is in charging mode and the transistor Q1 is off. Indicator LED serves two purpose, one primarily is to give us idea
that the battery is charging and another is to ensure that the Q1 is off. During brownouts,...
6V to 12V dc-dc boost converter by 555 timer
This 6V to 12V dc-dc boost converter can drive a load in 12V about 3A current.The 555 timer IC is operated in astable mode, generates about 29Khz frequency of about 54% duty cycle drives the input of TIP41C transistor.1000uF capacitor smoothens the output voltage of the dc-dc converter.LED and 1.5Kohm resistor serves as indicator and load for output stability when no load is connected.You can add a 12V zener diode (1N5242B)across output to ground for further output stability.
The 39ohm resistor at the base of transistor is rated 1W, the rest 1/4W or more.Inductor can be made out of #22AWG wire wound around on an old transistor radio ferrite...
12V to 5V DC converter using 7805 regulator IC
This simple converter project uses 7805 IC to convert 12V dc from a battery to 5V DC. This converter also can be made even only one component, the 7805 regulator. Converter can produce a maximum current of 1.5A (with heatsink) at 5V from an input of 8V to 15V. The capacitors are optional and can be omitted.
This is suitable for powering devices that uses 5V DC such as chargers,USB devices and oth...
3V Electronic Stun Gun Circuit
Schematic-
This circuit above is a cheap version stun gun circuit that is powered by two AA baterry. The output of this electronic project is about 350V dc.
The heart of the circuit is the oscillator that is composed of Windings and transistor.
Primary winding P is composed of 16 turns of #24 AWG wire, feedback F is composed of 8 turns of #24 AWG wire, and secondary winding S is composed of 270 turns of #30 AWG magnetic wire. The output of Sec winding is rectified by diode bridge. The output capacitor is an electrolytic type that is rated 400V above. Capacitance of the output capacitor depends on what available on hand,but always keep in mind...
220V led lamp (AC powered LED)
220V led lamp (AC powered LED)
Schematic-
This LED lamp is powered by an ac source available in your outlet.
To build this LED lamp you will need 20 white LED and capacitor.
the Lamp consumes about 4w of power.
Note:
Capacitor C1 is mylar type and do not use electrolytic capacitor. Avoid touching any part of the circuit
since it is powered directly to the main ac source.
Capacitor of this LED lamp is as follows:
220nF if ac line is 220V @ 60Hz
270nF if ac line is 220V @ 50Hz
470nF if ac line is 110V @ 60Hz
578nF if ac line is 110V @ 6...
22 Watt Audio Amplifier Circuit
The 22 watt amp is easy to build, and very inexpensive. The circuit can be used as a booster in a car audio system, an amp for satellite speakers in a surround sound or home theater system, or as an amp for computer speakers. The circuit is quite compact and uses only about 60 watts.
Schematic-
Parts List-
R1 - 1 - 39K 1/4 Watt Resistor
C1,C2 - 2 - 10uf 25V Electrolytic Capacitor
C3 - 1 - 100uf 25V Electrolytic Capacitor
C4 - 1 - 47uf 25V Electrolytic Capacitor
C5 - 1 - 0.1uf 25V Ceramic Capacitor
C6 - 1 - 2200uf 25V Electrolytic Capacitor
U1 - 1 - TDA1554 Two Channel Audio Amp Chip
MISC - 1 - Heatsink For U1, Binding Posts (For Output),...
Voltage Inverter Circuit
This simple and inexpensive circuit can produce a dual (positive and negative) voltage from a single supply input. It is therefore extremely useful for powering opamp and other circuits that require a dual voltage from a single battery. The circuit will operate at an input voltage from around 5V to 20V and produce a output from +-2.5V to +-10V.
Schematic-
Parts List-
R1 - 1 - 1M Linear Pot
C1,C2 - 2 - 15uf 25V Electrolytic Capacitor
U1 - 1 - LM380 Audio Amp Chip
MISC - 1 - Heatsink For U1, Binding Posts (For Input/Output), Wire, Board
Notes -
1) U1 dissipates around 1W and will therefore require a heatsink.
2) R1 is used to equalize the...
Computer Controlled Frequency Counter/Logic Probe Circuit
This circuit is a stable frequency counter accurate to 5 significant digits. The range is 0 - 30MHz with an input sensitivity of greater then 100mV. The probe connects to the PC serial port. So by using the crystal oscillator already present on your PC serial card and software calibration, the Probes' external circuitry is kept to a minimum. Probe 9 can also be used as a logic probe/analyzer using included software (LPROBE92.EXE).
Schematic-
Parts List-
R1,R2,R3,R4 - 4 - 100K 1/4W Resistor
R5 - 1 - 10M 1/4W Resistor
R6, R7 - 2 - 3.3K 1/4W Resistor
R8 - 1 - 390 Ohm 1/4W Resistor
R9 - 1 - 1M 1/4W Resistor
C1, C4 - 2 - 0.1uF Ceramic Disc...
Car Alarm Arming Horn Beep Canceller Circuit
It's a great convenience that most modern cars come with a built in alarm, however it is nothing but noise pollution that the horn sounds when the alarm is armed. Disconnecting the alarm system from the horn relay will eliminate this, but prevent the horn from sounding in the even of an actual alarm. This circuit serves to silence the arming beep yet maintain the alarm by introducing a small delay into the signal. It sits between the alarm and horn relay. The alarm must provide a constant horn signal for at least 3 seconds before the horn relay is activated. That way the quick "beep" will never activate the horn relay, while the constant alarm...
Automatic Headlight Brightness Switch Circuit
Driving the highway with your high-beam headlights can really increase your visibility, but can be a blinding hazard for other drivers. This simple circuit can be wired into your headlight switch to provide automatic switching between high and low beam headlights when there is oncoming traffic. It does this by sensing the lights of that traffic. In this way, you can drive safely with your high-beams on without blinding other drivers.
Schematic-
Parts List-
R1 - 1 - 5K 1/4W Resistor
R2, R3, R4 - 3 - 5K Pot
Q1 - 1 - NPN Phototransistor
Q2 - 1 - 2N3906 PNP Transistor
K1 - 1 - Low Current 12V SPST Relay
K2 - 1 - High Current 12V SPDT Relay...
Solid State Tesla Coil/High Voltage Generator Circuit
This is a fun and useful circuit for demonstrating high frequency high voltge. It can produce up to about 30KV, depending on the transformer used. It is cheap and easy to make, thanks to the standard TV flyback transformer used. It can power LASERS (although I have never tried), and even cause a fluorescent bulb to light from as much as 2 feet away.
Parts List-
R1 - 1 - 27 Ohm 5W Resistor
R2 - 1 - 240 Ohm 5W Resistor
BR1 - 1 - 50 Volt, 6 Amp Bridge Rectifier
C1 - 1 - 8000uf, 35 Volt Capacitor
Q1, Q2 - 2 - 2N3055 NPN Power Transistor
T1 - 1 - 24V 5A Transformer (See "Notes")
T2 - 1 - TV Flyback Transformer (See "Notes")
S1 - 1 -...
Dual Polarity Power Supply Circuit
When working with electronics, you always need one basic thing; power. This power supply is great for powering all kinds of electronic projects. It produces a well filtered, variable 1.2-30 volts at 5 amps. It is easy to build and the parts are realitively easy to find.
Schematic-
Parts List-
C1 - 1 - 14000uF or 10000uf 40 VDC Electrolytic Capacitor
C2 - 1 - 100uF 50Vdc Electrolytic Capacitor
C3 - 1 - 0.1uF Disc Capacitor
C4 - 1 - 0.01uF Disc Capacitor
R1 - 1 - 5K Pot
R2 - 1 - 240 Ohm 1/4 W Resistor(See Notes)
U1 - 1 - LM338K 1.2 to 30 Volt 5 Amp Regulator
BR1 - 1 - 10 Amp 50 PIV Bridge Rectifier
T1 - 1 - 24 V 5 Amp Transformer
S1...
Portable CD Player Adapter For Car Circuit
Whenever I'm in the car listening to my favourite CD, it always happens; my batteries go dead. To solve that problem, I built this extremely simple regulator circuit. It steps down the 12V from the lighter socket to 9V which is used by the CD player. Different CD players (I have a Sony Discman) may require different voltages, so just use the correct regulator. All the 78xx series regulators have the same pin out, so the circuit is universal.
Schematic-
Parts List-
C1 - 1 - 1000uF 25V Electrolytic Capacitor
C2 - 1 - 10uF 25V Electrolytic Capacitor
C3 - 1 - 1uF 15V Elextrolytic Capacitor
C4 - 1 - 0.1uF 15V Electrolytic Capacitor
U1 - 1 -...
Light/Dark Detector Circuit
This handy little circuit can tell the difference between darkness and light, making it very useful for switching on and off signs, porch lights or other things when it gets dark or light.
Schematic-
Parts List-
R1 - 1 - 100K Pot
Q1 - 1 - 2N3904 NPN Transistor
Q2 - 1 - NPN Phototransistor
RELAY - 1 - 9V Relay
MISC - 1 - Board, Wire, 9V Battery Snap (if battery used), Knob For R1
Notes-
1) R1 Adjusts sensitiv...
IR Remote Control Jammer Circuit
Don't like your little brother's TV channel selection? Hate the volume your wife sets the stereo at? Want to just annoy someone? This circuit does all that and more by jamming most IR remote signals. The circuit releases a flood of pulsing IR light that confuses the reciever by corrupting the data stream.
Schematic-
Parts List-
R1 - 1 - 100K 1/4W Resistor
R2 - 1 - 150K 1/4W Resistor
R3 - 1 - 10K 1/4W Resistor
R4 - 1 - 1K 1/4W Resistor
R5 - 1 - 22 Ohm 1/4W Resistor See "Notes"
C1 - 1 - 10nF Ceramic Disc Capacitor
C2 - 1 - 1uF Electrolytic Capacitor
D1, D2, D3 - 3 - High Output IR LED
Q1 - 1 - 2N4403 PNP Transistor
Q2 - 1 - 2N4401 NPN...
Dual Polarity Power Supply Circuit
This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts. It is great for powering op amp circuits, as well as other circuits that require a dual supply voltage.
Schematic-
Parts List-
C1, C2 - 2 - 2200uF 35V Electrolytic Capacitor
C3, C4, C5, C7 - 4 - 1uF 35V Electrolytic Capacitor
C6, C8 - 2 - 100uF 35V Electrolytic Capacitor
R1, R4 - 2 - 5K Pot
R2, R3 - 2 - 240 Ohm 1/4 W Resistor
BR1 - 1 - 2A 30V Bridge Rectifier
U1 - 1 - LM317 Adjustable Positive Regulator
U2 - 1 - LM337 Adjustable Negative Regulator
T1 - 1 - 30V Center Tapped 2 Amp Transformer
S1 - 1 - SPST 2 Amp Switch
MISC - 1...
Car Battery Charger
This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the battery is fully charged, the circuit switches off and lights a LED, telling you that the cycle has finished.
Schematic-
Parts List-
R1 - 1 - 500 Ohm 1/4 W Resistor
R2 - 1 - 3K 1/4 W Resistor
R3 - 1 - 1K 1/4 W Resistor
R4 - 1 - 15 Ohm 1/4 W Resistor
R5 - 1 - 230 Ohm 1/4 W Resistor
R6 - 1 - 15K 1/4 W Resistor
R7 - 1 - 0.2 Ohm 10 W Resistor
C1 - 1 - 0.1uF 25V Ceramic Capacitor
C2 - 1...
Load Sensing Power Switch Circuit
This circuit will automatically switch on several mains-powered "slave" loads when a "master" load is turned on. For example, it will switch on the amplifier and CD player in a stereo system when the receiver is turned on. It works by sensing the current draw of the "master" device through a low value high wattage resistor using a comparator. The output of that comparator then switches on the "slave" relay. The circuit can be built into a power bar, extension cord or power center to provide a convenient set of "smart" outlets that switch on when the master appliance is powered (turn on the computer monitor and the computer, printer and other...
Automatic 12V Lead Acid Battery Charger Circuit
This charger will charge any 12V lead acid battery including flooded, gel and AGM. It is fully automatic and will charge at a rate up to about 4A until the battery voltage reaches a preset point at which it will switch to a very low current float charge. If the battery voltage drops again the charger will begin charging until the voltage once again reaches the cut off point. In this way it can be left connected to a battery indefinitely to maintain full charge without causing damage. An LED indicates when the battery is fully charged.
Schematic-
Parts List-
R1, R3 - 2 - 330 Ohm 1/4W Resistor
R2 - 1 - 100 Ohm 1/4W Pot
R4, R5, R7, R8 - 4 -...
6V to 12V Converter Circuit
This inverter circuit can provide up to 800mA of 12V power from a 6V supply. For example, you could run 12V car accessories in a 6V (British?) car. The circuit is simple, about 75% efficient and quite useful. By changing just a few components, you can also modify it for different voltages.
Schematic-
Parts List-
R1, R4 - 2 - 2.2K 1/4W Resistor
R2, R3 - 2 - 4.7K 1/4W Resistor
R5 - 1 - 1K 1/4W Resistor
R6 - 1 - 1.5K 1/4W Resistor
R7 - 1 - 33K 1/4W Resistor
R8 - 1 - 10K 1/4W Resistor
C1,C2 - 2 - 0.1uF Ceramic Disc Capacitor
C3 - 1 - 470uF 25V Electrolytic Capcitor
D1 - 1 - 1N914 Diode
D2 - 1 - 1N4004 Diode
D3 - 1 - 12V 400mW Zener Diode...
Time Delay Relay Circuit
A time delay relay is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a simple adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to about 20 seconds with the parts specified. The current capacity of the circuit is only limited by what kind of relay you decide to use.
Schematic-
Parts List-
R1 - 1 - 1 Meg Pot
R2 - 1 - 10 K 1/4 Watt Resistor
C1 - 1 - 10uf 25V Electrolytic Capacitor
C2 - 1 - 0.01uf Ceramic Disc Capacitor
D1,D2 - 2 - 1N914 Diodes
U1 - 1 - 555 Timer IC
RELAY - 1 - 9V Relay
S1 - 1 - 1A 120V SPST Switch
MISC - 1 - Board, Wire, Socket...
Voltage Inverter
This simple circuit is a good solution to the powering a dual supply op amp from a single battery problem. The circuit simply takes a positive voltage and inverts it. It uses only one 555 timer and a few other passive components, so it doesn't add much in the way of size and cost to a project.
Schematic-
Parts List-
R1 - 1 - 24K 1/4 Watt Resistor
R2 - 1 - 56K 1/4 Watt Resistor
C1 - 1 - 3300pF 25V Ceramic Capacitor
C2 - 1 - 47uF 25V Electrolytic Capacitor
C3 - 1 - 10uF 25V Electrolytic Capacitor
C4 - 1 - 100uF 25V Electrolytic Capacitor
D1, D2 - 2 - 1N4148 Silicon Diode
U1 - 1 - 555 Timer
MISC - 1 - Wire, Bo...
One Tube Regenerative Radio Circuit
A regenerative radio works by feeding back a small amount of amplified output of the detector back into the input. Thus it achieves sensitivity far beyond what only a detector could alone. This simple regen radio uses a single tube as it's detector and amplifier; the "Audion". It's a great first project for those wishing to bring back some nostalgia by building one of the first amplified radio sets. Built on a board using point to point wiring and a set of period headphones, it can be a great functional conversation piece.
Schematic-
Parts List-
R1 - 1 - 50K Linear Taper Pot
R2 - 1 - 2.2 Meg 1/4W Resistor
R3 - 1 - 10K 1/4W Resistor
C1 -...
Single Chip AM Radio
The ZN414 IC contains an entire automatic gain controlled AM receiver in a small three pin package. With only a few external components, a simple radio with excellent selection and reception can be constructed. Since the chip also uses a low supply voltage of only 1.3V, 3V coin cell battery can make for a physically small circuit with many covert uses. The chip has a wide bandwidth of between 150KHz and 3MHz, so by playing with values in the tuning circuit you can pick up a wide variety of signals.
Schematic-
Parts List-
R1 - 1 - 100K 1/4W Resistor
R2 - 1 - 470 Ohm 1/4W Resistor
R3 - 1 - 1K 1/4W Resistor
C1 - 1 - 0.04uF Ceramic Disc Capacitor...
Simple Two Speed Contactor DC Motor Controller
The simplest of all motor controllers (besides a straight on/off switch) is the contactor controller. I designed this contactor controller for use in my electric scooter project. It is based around three 12V relays, two 12V batteries, two switches and of course a motor. Having no silicon to "fry", it is quite reliable and robust. A contactor controller works by rearranging the two (or more) supply batteries between series and parallel. This gives the motor a slow speed (batteries in parallel, current adds) and a fast speed (batteries in series, voltage adds). This assures that both batteries are discharged equally. When the circuit is "at rest",...
Simple Servo Controller Circuit
Schematic-
Parts List-
R1 - 1 - 820 Ohm 1/4W Resistor
R2 - 1 - 68K 1/4W Resistor
R3 - 1 - 10K 1/4W Resistor
R4 - 1 - 1K 1/4W Resistor
R5 - 1 - 1K Linear Taper Pot
C1 - 1 - 1uF 16V Electrolytic Capacitor
Q1 - 1 - 2N3904 NPN Transistor 2N2222, Most Small Signal Transistors
U1 - 1 - 555 Timer IC
MISC - 1 - Board, Wire, Knob For R1, 8 Pin Socket For U1
Notes-
1. R1 adjusts the position of the servo.
2. Connect the servo to the circuit as shown in the schematic. For common Futaba servos, the red wire is power, the black wire is ground, and the white wire is contr...
Polarity Tester Circuit
Parts List-
R1 - 1 - 1K 1/4W Resistor
D1 - 1 - Green LED
D2 - 1 - Red LED
D4, D5, D6, D7 - 4 - 1N4001 Silicon Diode
MISC - 1 - Board, Wire, Case, Probes
Notes-
1. Email Dudley LeRoux with questions, comments, etc.
2. To use the circuit, just connect your probes to the source under test. If D1 lights up, the left most probe (on the schematic) is connected to positive. The opposite is true if the left probe is negative. If both LEDs are on, the source being probed is AC.
3. Be careful when using this tester not to probe a source greater than about 1...
Pine Racecar Victory Judge
Parts List-
R1, R2 - 2 - 100 Ohm 1/4W Resistor
R3, R4 - 2 - 100K 1/4W Resistor
D1, D2 - 2 - Standard LED
SCR1, SCR2 - 2 - 6A, 200V SCR (such as the 106B)
S1, S2 - 2 - See Notes
K1 - 1 - Small 12V Relay
MISC - 1 - Board, Wire
Notes
1. S1 and S2 are small lever type micro switches. Most any kind will do, as long as they are sensitive enough to be activated by the wheels of the cars. They should be positioned on the track so that the front wheels of the cars will run over them as the cars just cross the finish line.
2. To reset the circuit, disconnect and then reconnect power. You can add a normally closed switch in series with the power...
Low Voltage Alarm
Parts List-
R1, R3 - 2 - 1K 1/4W Resistor
R2 - 1 - 5K Pot
U1 - 1 - LM339 Op Amp IC
D1 - 1 - 1N5233B Zener Diode
D2 - 1 - LED
BZ1 - 1 - Piezo Buzzer
MISC - 1 - Board, wire, socket for IC
Notes-
1. The circuit will operate from 9V to 12V.
2. Adjust R2 until the alarm goes off at the correct volta...
Simple Air Flow Detector
Parts List-
R1 - 1 - 100 Ohm 1/4W Resistor
R2 - 1 - 470 Ohm 1/4W Resistor
R3 - 1 - 10k 1/4W Resistor
R4 - 1 - 100K 1/4W Resistor
R5 - 1 - 1K 1/4W Resistor
C1 - 1 - 47uF Electrolytic Capacitor
U1 - 1 - 78L05 Voltage Regulator
U2 - 1 - LM339 Op Amp
L1 - 1 - #47 Incandescent lamp with glass removed (See "Notes")
D1 - 1 - LED
MISC - 1 - Board, Wire, Sockets for ICs, etc.
Notes-
1. The glass will have to be removed from L1 without breaking the filament. Wrap the glass in masking tape and it in a vise. Slowly crank down until the glass breaks, then remove the bulb and carefully peel back the tape. If the filament has broken, you will need...
Simple Touch Switch
Parts List -
R1 - 1 - 10 Meg 1/4W Resistor
R2 - 1 - 47K 1/4W Resistor
R3 - 1 - 120k 1/4W Resistor
R4 - 1 - 470 Ohm 1/4W Resistor
C1 - 1 - 15uF Electrolytic Capacitor
D1 - 1 - 1N4007 Silicon Rectifier Diode
Q1 - 1 - 2N5458 N Channel Field Effect Transistor
Q2 - 1 - 2N2222 NPN Transistor 2N3904
Q3 - 1 - 2N3906 PNP Transistor
K1 - 1 - Relay w/12V Coil, Contacts To Suit Application
MISC - 1 - Board, Wire, Small Metal Pad For Touch Pad
Notes
1. The touch pad can be most easily made by cutting a small square of PCB material and then soldering on a single wire. Alternatively, something like a penny glued to a plastic backing will do the...
Simple Lie Detector Circuit
Parts List-
R1 - 1 - 33K 1/4W Resistor
R2 - 1 - 5K Pot
R3 - 1 - 1.5K 1/4W Resistor
C1 - 1 - 1uF 16V Electrolytic Capacitor
Q1 - 1 - 2N3565 NPN Transistor
M1 - 1 - 0-1 mA Analog Meter
MISC - 1 - Case, Wire, Electrodes (See Nots)
Notes
1. The electrodes can be alligator clips (although they can be painful), electrode pads (like the type they use in the hospital), or just wires and tape.
2. To use the circuit, attach the electrodes to the back of the subjects hand, about 1 inch apart. Then, adjust the meter for a reading of 0. Ask the questions. You know the subject is lying when the meter chang...
