Free Circuit Diagram

We  can make a simple touch switch using only two inverter gates, two resistors, and two capacitors. The schematic diagram of the circuit is shown in the figure below. At power up, the output (of U1A) will be high, and the inverting output will be low because U1A gate will be triggered to ground level [...]

This is a simple circuit for negative to positive supply logic level shifter. This circuit used to shift the logic level from minus to ground (such as MOS) to any logic level and from a plus to ground supply (such as TTL). Here is the circuit: This circuit uses the 2N3970 that provide [...]

This is a video tutorial of logic probe or logic analyzer. This video shows what is logic probe and how can the logic probe analyzes. There are two main operation in the logic probe work, first is timing analyze and second is state analysis. In this video also shows the different between them. Beside [...]

Our reader Andrea (andrea[dot]perugia[-at-]gmail[dot] com) sent his circuit to us, and he creates the circuit for educational intent. The main purpose is to show that you can toggle an output state electronically, although physically you use only a push button switch. Here is what he said about the cicuit : This simple [...]

This is a FM Transmitter circuit. This circuit uses logic gates. This transmitter circuit has a RF oscillator. This oscillator uses 10.7Mhz ceramic filter and inverter N2 to drive the parallel combination of N4 to N6 through N3. Here is the circuit: The output impedance will be low because these inverters are [...]

This circuit is similar with our previous dimmer circuit, but the gate control is full-wave rectified using diode bridge. This circuit can be used to replace electric switch for your incandescent lamp, brushed motor, soldering iron or heater. Here is the schematic diagram of the dimmer switch: Please note that his dimmer switch [...]