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Electronic coin tosser – Circuit Schematic
Electronic coin tosser
The circuit shown simulates the flipping of a coin by merely pushing switch PB1...
Calculator-to-stopwatch converter – Circuit Schematic
Calculator-to-stopwatch converter
This circuit can be fitted to any calculator existing calculator battery via the push-on with an automatic constant to enable it to be push-off switch and the e...
Capacitance multiplier – Circuit Schematic
Capacitance multiplier
The circuit can be used to simulate large capacitances using small value components. With the values shown and C - 10 µ¥, an effective capacitance of 10,0...
Vacuum fluorescent display – Circuit Schematic
Vacuum fluorescent display
This circuit uses the CA3207 sequence driver and CA3208 segment latch-driver in combination to drive display devices of up to 14 segments with up to 14 characte...
Precision voltage-to-frequency converter – Circuit Schematic
Precision voltage-to-frequency converter
In this circuit, integration is performed by using a conventional operational amplifier and feedback capacitor, CF. When the integrator's output crosses the nom...
Room Ioniser circuit
This is a voltage multiplier circuit acting as an Ioniser. Its calculated to feed 220V from mains and the output is about 6KV. Caution should take with the circ...
TV Pattern Generator (ZNA234E)
This Circuit uses the ZNA234E IC which makes available all the waveforms necessary to produce the crosshatch, dot and greyscale test patterns on a television sc...
RC Low-Pass passive Filter – Circuit Schematic
RC Low-Pass passive Filter
What is the purpose of this circuit? Basically it has two roles: to pass the desired low frequency signals and stop the unwanted high frequency signals. Open th...
Fuse tester with LEDs – Circuit Schematic
Fuse tester with LEDs
This indicator shows through a dual-LED see if a fuse is intact. The module is designed for 230 V AC. The green LED illuminates when the fuse is still good, the...
Thyristor / TRIAC Tester – Circuit Schematic
Thyristor / TRIAC Tester
This is a simple but effective and thyristor TRIAC Tester. Operation at a good thyristor / triac: LED lights when SW3 is pressed. LED turns off when SW2 is pres...
Diode Tester schematic – Circuit Schematic
Diode Tester schematic
With this tester you can check whether a diode is working properly. In the table you can see what LED to indicate the positions of the switch and condition of t...
Who's First" game lights – Circuit Schematic
Who's First" game lights
The circuit below turns on a light corresponding to the first of several buttons pressed in a "Who's First" game. Three stages are shown but the circuit can be ...
High Speed Photography circuit – Circuit Schematic
High Speed Photography circuit
Simple electronics provides the foundation for many closed loop control systems. Since the principle components that we would wish to control for HSP are electr...
Video Stabilizer circuit – Circuit Schematic
Video Stabilizer circuit
Have you ever attempted to copy a commercially produced video only to end up with a distorted and jumpy image? If so, then you have run afoul of MacroVision. Ma...
Electronic I CHING Detector – Circuit Schematic
Electronic I CHING Detector
This circuit is the electronic emulation of the I Ching, a form of divination originating in China. In the classical form, the response is obtained by the manip...
X-Rays with Receiving Tubes – Circuit Schematic
X-Rays with Receiving Tubes
Old TV tubes are used as cold cathode x-ray emitters in a simple apparatus developed by Bob Templeman of Chicago, Illinois. With selected beam power tubes of th...
Litter Box with 12V pc fan – Circuit Schematic
Litter Box with 12V pc fan
Not every new use of technology requires a microcontroller. This one uses a 12 volt computer fan from CompUSA, a snap close food box from Walmart, some PVC pipe...
Air Ioniser circuit – Circuit Schematic
Air Ioniser circuit
A basic mains driven Cockroft ladder high voltage generator is shown in the schematic. This is functionally the same as a project in Electronics Today Internati...
DIY GPS Jammer – Circuit Schematic
DIY GPS Jammer
Hackers listen up. Everyone understands and enjoys the utilitarian benefits that GPS has brought to our lives but what if it didn’t work any more? I suppose y...
Morse Keyer circuit – Circuit Schematic
Morse Keyer circuit
This is not a sophisticated automatic keyer but it is lot QRP to build and to have fun operating it. When the paddle is connected to the DOT terminal, C1 sta...