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 -...

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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...

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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...

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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...

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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...

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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...

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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 -...

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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...

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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...

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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...

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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 -...

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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...

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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",...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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Rain Detector Circuit

Parts List - R1 - 1 - 1K 1/4 W Resistor R2 - 1 - 680 Ohm 1/4 W Resistor D1 - 1 - 1N4001 Silicon Diode BZ1 - 1 - 12V Buzzer S1 - 1 - SPST Switch SCR1 - 1 - C106B1 SCR 106CY SENSOR - 1 - See Notes MISC - 1 - Board, Wire, Case, PC Board (For Sensor) Notes 1. The sensor is a small piece of PC board etched to the pattern showen in the schematic. The traces should be very close to each other, but never touching. A large spiral pattern would also work. 2. Make sure to use a loud buzz...

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3V LED Chaser

General There are many 9V chaser circuits that seem to waste about 7V when driving LEDs that are only about 2V. This project is unique, because it uses only two inexpensive alkaline battery cells totaling 3V for power. Since most of the waste is eliminated, the cells last a long time. Unlike the other circuits, this one flashes the LEDs for only about 30ms each, further extending the battery life. For user convenience, it has a stepper speed control and a brightness control. At slower speeds and with reduced brightness, the battery life is further extended considerably. Mounted in a circle, the LEDs appear to rotate as they step from one to...

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Digital Keypad Combination Lock

Parts- C1 - 1 - 1uF 25V Electrolytic Capacitor C2 - 1 - 220uF 25V Electrolytic Capacitor R1 - 1 - 2.2K 1/4W Resistor Q1 - 1 - 2N3904 NPN Transistor D1 - 1 - 1N4148 Rectifier Diode K1 - 1 - 12V SPDT Relay Any appropriate relay with 12V coil U1 - 1 - LS7220 Digital Lock IC S1-S12 - 12 - SPST Momentary Pushbutton Keypad (see notes) HD1 - 1 - 12 Position Header Notes- 1. To set the combination, wire the appropriate switches to U1 pins 3, 4, 5 and 6 using the header. For example if S1 was connected to pin 3, S2 to pin 4, S3 to pin 5 and S4 to pin 6, the combination would be 1,2,3,4. Now wire all other unused switches across the header to pin...

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AC Motor Speed Controller

Parts List - R1 - 1 - 27K 1W Resistor R2 - 1 - 10K 1/4W Resistor R3 - 1 - 100K 1/4W Resistor R4 - 1 - 33K 1/4W Resistor R5 - 1 - 2.2K 1/4W Resistor R6 - 1 - 1K 1/4W Resistor R7 - 1 - 60K Ohm 1/4W Resistor R8 - 1 - 3K Linear Taper Trim Pot R9 - 1 - 5K Linear Taper Pot R10 - 1 - 4.7K Linear Taper Trim Pot R11 - 1 - 3.3K 1/4W Resistor R12 - 1 - 100 Ohm 1/4W Resistor R13 - 1 - 47 Ohm 1W Resistor (See Notes) C1, C3 - 2 - 0.1uF Ceramic Disc Capacitor C2 - 1 - 100uF 50V Electrolytic Capacitor D1 - 1 - 6V Zener Diode Q1 - 1 - 2N2222 NPN Transistor 2N3904 SCR1 - 1 - ECG5400 TR1 - 1 - TRIAC (See Notes) U1 - 1 - DIAC Opto-Isolator (See...

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LED Thermometer

LED thermometer is designed for in home use, to read temperatures between about 60 and 78 degrees Fahrenheit. It is based around a precision temperature sensor IC, the LM34DZ. This sensor require no calibration and can measure temperatures of between -50F and +300F. While the circuit shown here does not use the full range of that sensor, it can be modified to do so by simply changing the voltage reference to U2 at the sacrifice of precision. Parts List- C1 - 1 - 1uF 25V Electrolytic Capacitor C2 - 1 - 10uF 25V Electrolytic Capacitor R1 - 1 - 2.2K 1/4W Resistor R2, R5, R7 - 3 - 1K Trim Pot R3 - 1 - 1K 1/4W Resistor R4 - 1 - 1.5K 1/4W Resistor...

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Electronic Dice Circuit

Schematic - Parts List - R1, R5, R6 - 3 - 22K 1/4W Resistor R2 - 1 - 10K 1/4W Resistor R3 - 1 - 4.7K 1/4W Resistor R4 - 1 - 150K 1/4W Resistor R7 - R13 - 7 330 Ohm 1/4W Resistor C1 - 1 - 1uF Electrolytic Capacitor C2 - 1 - 4.7uF Electrolytic Capacitor D1 - 1 - 1N4148 Signal Diode D2 - D8 - 7 - Red/Green/Yellow LED Q1 - 1 - 2N3904 NPN Transistor U1 - 1 - 555 Timer IC U2 - 1 - 74LS192 4 Bit Counter IC U3 - 1 - 74LS08 Quad Intengreted AND Gate IC S1 - 1 - SPST Momentary Pushbutton Switch MISC - 1 - Board, Wire, Sockets For ICs, Case Notes - 1. Pushing and holding S1 causes the LEDs to rapidly cycle. Releasing the button locks the...

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7 Segment LED Counter Circuit

Schematic - 7 Segment Reference - Parts List - R1-R7 - 7 - 470 Ohm 1/4 Watt Resistor U1 - 1 - 74LS90 TTL BCD Counter IC U2 - 1 - 74LS47 TTL Seven Segment Display Driver IC DISP1 - 1 - Common Anode 7 Segment LED Display MISC - 1 - Board, Sockets For ICs, Wire Notes - 1. All pulses to be counted are to be TTL compatible. They should not exeed 5V and not fall below ground. 2. You can add more digits by building a second (or third, or fourth, etc...) circuit and connecting the pin 11-6 junction of the 74LS90 and 74LS47 to pin 14 of the 74LS90 in the other circuit. You can keep expanding this way to as many digits as you wa...

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12V to 120V Inverter Circuit

Parts - C1, C2 - 2 - 68 uf, 25 V Tantalum Capacitor R1, R2 - 2 - 10 Ohm, 5 Watt Resistor R3, R4 - 2 - 180 Ohm, 1 Watt Resistor D1, D2 - 2 - HEP 154 Silicon Diode Q1, Q2 - 2 - 2N3055 NPN Transistor (see "Notes") T1 - 1 - 24V, Center Tapped Transformer (see "Notes") MISC - 1 - Wire, Case, Receptical (For Output) Notes 1. Q1 and Q2, as well as T1, determine how much wattage the inverter can supply. With Q1,Q2=2N3055 and T1= 15 A, the inverter can supply about 300 watts. Larger transformers and more powerful transistors can be substituted for T1, Q1 and Q2 for more power. 2. The easiest and least expensive way to get a large T1 is to re-wind...

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TRIAC Light Dimmer

Schematic - Parts List - R1 - 1 - 50K Pot R2 - 1 - 15K 1/2W Resistor C1, C2 - 2 - 0.068 250V Capacitor L1 - 1 - Lamp To Be Controlled (up to 350 watts) L2 - 1 - Neon Lamp TR1 - 1 - 40502 TRIAC MISC - 1 - Case, Knob, Heatsink For TR1, Wire, Socket For L1 Notes - 1. This circuit is for 117VAC only. 220 or 240 V will burn up the circuit. L1 can be a maximum of 350 watts. 2. The circuit must be installed and used in a ca...

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Strobe Light Circuit

Schematic - Parts List - R1 - 1 - 10 Meg, 1/4 Watt Resistor D1, D2 - 2 - 1N4003 Silicon Diode C1, C2 - 2 - 10uF 350V Capacitor C3 - 1 - 0.1uF 400 Volt Mylar Capacitor T1 - 1 - 4KV Trigger Transformer (see "Notes") FT - 1 - Flash Tube (see "Notes") L1 - 1 - Neon Bulb Q1 - 1 - 106 SCR S1 - 1 - 115V 1A SPST Switch MISC - 1 - Case, Wire, Line Cord Notes - 1. This ciruits is NOT isolated from ground. Use caution when operating without a case. A case is required for normal operation. Do not touch any part of the circuit with the case open or not installed. 2. Most any diodes rated at greater then 250 volts at 1 amp can be used instead...

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LED Chaser

Schematic - Parts List - R1 - 1 - 1 Meg 1/4W Resistor R2 - 1 - 100K Pot R3 - 1 - 1K 1/4W Resistor 220Ohm if using blue LEDs C1 - 1 - 0.1uF 16V Ceramic Disk Capacitor U1 - 1 - 4011 CMOS NAND Gate U2 - 1 - 4017 CMOS Counter LED1-10 - 10 - LEDs Of Any Colour MISC - 1 - Board, Sockets For ICs, Knob For R2 Notes 1. Use R2 to adjust the "chase rate". 2. You may need to use a lower value resistor if you wish to use blue LEDs. Try 220 Ohm. 3. You can also use incandescent lamps instead of LEDs. Use transistors to drive them by connecting the base of the transistors to each of the outputs of the 4017 through a 1K resistor. Connect one end of...

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LASER Transmitter/Receiver

This set of two circuits from the basis for a very simple light wave transmitter. A LASER beam is modulated and then aimed at a receiver that demodulates the signal and then presents the information (voice, data, etc..). The whole thing is very easy to build and requires no specialized parts execpt for the LASER itself. Schematic of Transmitter - Schematic of Receiver - Parts - C1, C2 - 2 - 0.1uf Ceramic Disc Capacitor C3 - 1 - 100uf 25V Electrolytic Capacitor R1 - 1 - 100K Ohm 1/4W Resistor R2 - 1 - 1M Ohm 1/4W Resistor R3 - 1 - 10K Pot Q1 - 1 - NPN Phototransistor U1 - 1 - 741 Op Amp U2 - 1 - LM386 Audio Amp SPKR1 - 1 - 8 Ohm Speaker...

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Infrared Remote Switch Circuit

PCB Layout - Schematic PCB Parts Placement Parts List - R1 - 1 - 3 Meg 1/4W Resistor R2 - 1 - 1.2 Meg 1/4W Resistor R3 - 1 - 680 Ohm 1/4W Resistor R4 - 1 - 2K 1/4W Resistor R5 - 1 - 4.7K 1/4W Resistor R6 - 1 - 150 Ohm 1/4W Resistor C1 - 1 - 0.001uF Ceramic Disc Capacitor C2, C5 - 2 - 1uF 50V Tantalum Electrolytic Capacitor C3 - 1 - 47uF 50V Tantalum Electrolytic Capacitor C4 - 1 - 10uF 50V Tantalum Electrolytic Capacitor C5 - 1 - 150 Ohm 1/4W Resistor D1 - 1 - 1N4733 5V Zener Diode D2 - 1 - 1N4003 Rectifier Diode Q1 - 1 - 2N6071A TRIAC U1 - 1 - GP1U52X IR Module U2 - 1 - MC74HC74 D-Type Flip Flop U3 - 1 - MOC3011 Opto Isolator...

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