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Camera Trip Circuit – Circuit Schematic
Camera Trip Circuit
This circuit was used to trip a camera shutter. Grounding pin 2 of U1 makes pin 4 of U1 go high. This triggers both tim...
Fast Symmetrical Zener Clipper – Circuit Schematic
Fast Symmetrical Zener Clipper
The problem with using two zeners back to back in series to get symmetrical clamping is that the knee of the...
Diode Matching Circuit – Circuit Schematic
Diode Matching Circuit
This circuit can be used to match diodes for use in circuits where such a balance is necessary (a balanced modulator...
Electronic Roulette Game – Circuit Schematic
Electronic Roulette Game
R14 is set for an initial "starting" speed of the oscillator U1A and U1B. As C2 charges, oscillation begins slowin...
Frequency/Voltage Converter With Optocoupler Input – Circuit Schematic
Frequency/Voltage Converter With Optocoupler Input
In this circuit, the input from IC2 optocoupler is fed to the comparator input of the AD...
I/O Line Protectors – Circuit Schematic
I/O Line Protectors
A 5.1-V zener diode clamps positive-going transients, and a Schottky rectifier clamps negative-going transients. Th...
Color-tv-crosshatch-generator – Circuit Schematic
Color-tv-crosshatch-generator
This circuit provides a simple, low-cost crosshatch generator tor convergence and geometry adJUStments on color TVs. The generator is driven by two clocks, one...
Video-dc-restorer – Circuit Schematic
Video-dc-restorer
The main requirement for efficient de restoration is to provide a short time-constant during the clamp period, with a long time-constantlluring the active line...
Flame-ignitor – Circuit Schematic
Flame-ignitor
The spark developed by the circuit is suitable for a gas ignitor. Capacitor Cl is charged through Rl and Dl toward peak line voltage. C2 is simultaneously bein...
Stimulus-isolator – Circuit Schematic
Stimulus-isolator
This stimulus isolator uses a photo-SCR and a toroid for shaping pulses of up to 200 V at 200 p.A. ...
Scr-tester – Circuit Schematic
Scr-tester
The DUT"s(Device Under Test) cathode, anode, and gate are connected to the unit"s K, A, and G terminals, respectively. Pressing switch ·Sl feeds a gate cu...
Visible-red-continuous-laser-gun – Circuit Schematic
Visible-red-continuous-laser-gun
Ql and Q2 switch the primary windings of transformer Tl via a square wave at a frequency determined by its magnetic properties. Diodes Dl and D2 provide base r...
Flash slave driver – Circuit Schematic
Flash slave driver
In photography r a separate flash, triggered by the light of a master flash light, is often required to provide more light, fill-in shadows etc. The sensitivity...
Capacitance multiplier – Circuit Schematic
Capacitance multiplier
This circuit can be used to simulate large capacitances using small value components. With the values shown and C = 10 µf, an effective capacitance of 10,000...
Diode tester – Circuit Schematic
Diode tester
The circuit tests whether or not a diode is open, shorted, or functioning correctly. If lamp A lights, the diode under test is functional. When lamp B is lit, t...
Go no-go diode tester – Circuit Schematic
Go no-go diode tester
If lamp A or B is illuminated, the diode is serviceable. If both light, the diode is short circuited...
Zener tester – Circuit Schematic
Zener tester
This circuit provides a low cost and reliable method of testing zener diodes. RVl can be calibrated in volts, so that when LED 1 just lights, the voltage on pin...
Who is first – Circuit Schematic
Who is first
Here is a circuit for any question-and-answer party game...
heads or tails – Circuit Schematic
heads or tails
SI must be a push-to-make, release-to-break, switch...
Pot shot – Circuit Schematic
Pot shot
This is a circuit for a game of the shooting gallery variety. IC2a and b form an astable multivibrator clocking ICl which causes LEDs 1-8 to flash in turn LED 5...