40W Fluorescent Lamp Inverter

Parts- R1- 180 Ohm 1W Resistor R2- 47 Ohm 1/4W Resistor R3- 2.2 Ohm 1W Resistor (only needed once) C1, C2- 100uF 16V Electrolytic Capacitor C3- 100nF Ceramic Disc Capacitor Q1- TIP 3055 or 2N3055 or equivalent L1- See "Notes" T1- See "Notes" MISC- Wire, Case, Board, Heatsink For Q1, heatshrink, AM antenna rod for coil Notes- 1) Wind L1/T1. You will need an AM antenna rod that is about 60mm (2.5 inches) long to wind T1/L1 on. T1/L1 are wound on the same core. Shrink a layer of heatshrink over the core to insulate it. Leave 50mm of wire at each end of the coils. Primary: Wind 60 turns of 1mm diameter enamelled copper wire on the first...

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3 Channel Spectrum Analyzer

Parts- R1 -100K 1/4W Resistor R2- 820K 1/4W Resistor R3, R14, R16, R18- 2.2 Meg 1/4W Resistor R4, R5, R6- 22K Pot R7, R8, R9, R25, R27, R29- 10K 1/4W Resistor R10, R11, R12- 680 Ohm 1/4W Resistor R13. R15, R17- 580K 1/4W Resistor R19, R20, R21- 39K 1/4W Resistor R22, R23, R24- 47K 1/4W Resistor R26, R28, R30- 33 Ohm 1/4W Resistor C1, C5, C6- 0.012uF Polystyrene Capacitor C2, C9, C10, C11- 3.3uF Electrolytic Capacitor C3, C4- 0.0022uF Polystyrene Capacitor C7, C8- 47nF Polystyrene Capacitor C12, C13, C14- 0.47uF Electrolytic Capacitor C15, C16, C17- 22uF Electrolytic Capacitor D1, D2, D3- 1N4002 Silicon Diode D4, D5, D6, D8,...

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Simple Parallel (Printer) Port Interface

Parts- U1, U2, U3 - 74LS367 Buffer IC 74367, 74HC367 MISC - Case, Wire, Sockests, 18 Pin Socket (For Output), 25 Pin Connector (For Parallel Port), Ribben Ca...

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Wireless Auto Tachometer

PCB SCHEMATIC- Parts- C1 - 1 - 0.47uF Capacitor C2 - 1 - 47uF Electrolytic Capacitor D1 - 1 - 8V 1W Zener Diode D2, D3, D4 - 3 - 1N914 Diode M1 - 1 - 200uA Meter Q1, Q2 - 2 - 2N3391A Transistor R1, R2, R9 - 3 - 1K 1/2 W Resistor R3 - 1 - 47K 1/2 W Resistor R4 - 1 - 10K 1/2 W Resistor R5, R6 - 2 - 25K Trim Pot R7 - 1 - 10K Trim Pot R8 - 1 - 200 Ohm 2 W Resistor R10 - 1 - 15K 1/2 W Resistor R11 - 1 - 2.2K 1/2 W Resistor S1 - 1 - SPST Togglae Switch S2 - 1 - Three Position Single...

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12V To 24V DC-DC Converter Circuit

Parts- R1, R2, R3, R4,R8, R7 6 100K 1/4W Resistor R5 1 470 Ohm 1/2W Resistor R6 1 10K Linear Pot C1 1 0.01uF Mylar Capacitor C2 1 0.1uF Ceramic Disc Capacitor C3 1 470uF 63V Electrolytic Capacitor D1 1 1N4004 Rectifier Diode D2 1 BY229-400 Fast Recovery Diode Q1 1 BC337 NPN Power Transistor U1 1 LM358 Dual Op Amp IC L1 1 See Notes MISC - Board, Wire, Socket For U1, Case, Knob For R6, Heatsink for Q1 Notes- 1) R6 sets the output voltage. This can be calculated by Vout = 12...

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Water Detector With Pump Controller

Parts- R1 1 470 Ohm 1/4 W Resistor R2, R4 1 10K 1/4 W Resistor R3 1 6.8K 1/4 W Resistor R5 1 1 Meg Linear Taper Pot R6 1 51K 1/4 W Resistor C1 1 470uF 35V Electrolytic Capacitor C2 1 0.001uF Ceramic Disc Capacitor C3 1 0.05 uF Ceramic Disc Capacitor C4 1 20uF 35V Electrolytic Capacitor C5 1 6.8uF 35V Electrolytic Capacitor C6, C8 2 0.01uF Ceramic Disc Capacitor C7 1 100uF 35V Electrolytic Capacitor U1 1 LM1830 Fluid Detection IC U2 1 555 Timer Q1 1 2N5305 NPN Power Transistor D1, D2 2 1N4148 Signal Diode D3 1 1N4002 Rectifier Diode K1 1 Relay With 12V Coil (See Notes) S1 1 SPST Switch PROBES 1 Stainless Steel Probes (See...

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Wire Loop Alarm

R1 1 100K 1/2W 1% Resistor R2, R4 2 10K 1/2W 1% Resistor R3 1 1 Meg 1/2W 1% Resistor C1, C3 2 0.1uF Ceramic Disc Capacitor C2 1 0.01uF Ceramic Disc Capacitor IC1 1 4001UBE Quad 2-i/p NOR Gate Q1 1 MPSA14 Low Power NPN Transistor SIREN 1 Micro piezo siren 12V DC 150mA, 110dB @ 1M LOOP 1 See "Notes" MISC 1 Board, Wire, Socket For IC1 Notes- 1) The loop can be any type of hookup wire, with a maximum resistance of about 90K. Using very thin wire (40AWG, for example) will make a very sensitive trip wire, but will shorten the distance it can be strung due to the high resistance. 2) The siren can be replaced with a...

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