Free Simple Circuit Diagram
This is a coincidence detector circuit. This circuit is very useful for monitoring complex logic circuits. This circuit has two inputs, A and B. if A and B are both low, red LED will be on, and green will be on when A and B are both high. The indicator will be off when one of input is low and […]
Read more
Signal tracing is a method to find failure section of electronic circuit. This method is very common in troubleshooting audio electronics, since the tool for injection and monitoring will be very simple and cheap. The tracing method is done by injecting a signal source at one point and monitoring the response at other point, where the signal is assumed to […]
Read more
If you need to hold an analog signal for infinite period then this digital sample and hold circuit is the solution. This circuit uses a Exar XR-2240 programmable timer/counter as main component. The Exar XR-2240 is triggered when strobe input is applied. The Exar XR-2240 start count when the timer is triggered and output of bistable latch is set to […]
Read more
Variable adjustable voltage source is very important in electronic testing and experiment, no matter whether it’s just for hobby, professional research, or exploring new electronic circuit design. A very low voltage source sometimes is needed, and the following schematic diagram show such circuit, a 0-5V adjustable voltage source with very good stability: [National Semiconductor Application Note]
Read more