Free Circuit Diagram

This PWM  circuit needs only two inverter gates, so you can build up to 3 independent PWM circuit using only one IC chip, since there are at keast 6 inverter gates in one IC package. Here is the schematic diagram of the circuit: Please remember that you should connect any input pins of [...]

This circuit has similar function with inverting comparator with hysteresis, but the  output is not inverted. The output will be high if the input is higher than the upper threshold point, and the output will be low if the input is below the lower threshold point. Here is the circuit’s schematic diagram: What [...]

Comparator with hysteresis (Schmidt trigger) can be built using  LM339, LM239, LM2901, LM2901V, NCV2901, or MC3302  quad single supply comparator integrated circuit chips. Here is the circuit’s schematic diagram and formula: This circuit’s output will swing to high or low using two threshold values. If the last output is high, then the output [...]

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 [...]

If only a 5 volt positive supply is available and you need a negative voltage for op-amp or other biasing purpose, the you can generate the negative supply from the positive supply using this circuit. This circuit give same functionality with our previous 555 switching circuit, but now we use a CMOS inverter [...]

The DC to AC inverter circuit shown in the schematic here is very simple circuit since it produce square wave, but it’s enough to power many devices. Here is the schematic diagram of the inverter circuit: The MOSFET is configured as bridge, so the current will flow alternatively in through the primary windings [...]