Free electronic circuit design and schematic diagram
This is a schematic diagram of auto fuse monitor circuit. This circuit is very useful for automobile application, checking a live fuse without wasting any electrical power if the fuse is working fine. This circuit can check the fuse without removing the fuse from the working circuit. When the fuse is being tested, this fuse tester is connected across it. […]
Read more
This is a 4-range AC millivolt meter circuit. This circuit is used to measure a AC voltage in millivolt range. This circuit has frequency response of a few Hz to about 50 kHz. The non-linearity of the rectifier circuit is eliminated by placing the rectifier inside the op amp feedback path. This circuit read the input signal’s full-wave rectified average. […]
Read more
This is a Norton amplifier circuit with dc gain control. This circuit is formed by one section of an LM3900. This circuit has dc gain-control input ranges from 10 V for maximum gain down to 0 V for minimum gain. Here is the schematic diagram of the circuit:
Read moreBelow is video tutorial about a noise of a non-inverting operational amplifier circuit. On this video, we are explained about how to calculate the noise of a non inverting amplifier. What we have to do first is ground all the voltage sources. Because now all voltage sources is grounded, so the noise of non inverting configuration is exactly the same […]
Read more
This is an active antenna circuit with gain. This circuit is used to bost the signal. This circuit is made from a few transistors and other components. This circuit can provide RF gain of about12 to 18 dB. This circuit uses Q2 as a voltage amplifier. the RF signal direct-coupled from Q1’s Source terminal to the base of Q2. The […]
Read more
When the resistance value of a temperature, light, pressure, or any other resistive sensors Rs drops below a certain point (adjusted by a preset potentiometer), the SCR (silicon controlled switch) will be triggered. The sensor (Rs) and the potentiometer placement can be interchanged to get opposite action, where the SCR need to be triggered at the increase of sensing resistor […]
Read more
This voltage regulator circuit gives a stable 5V output from unregulated inputs (more than 5V). The stability of the output voltage is good enough, only change less than 0.1 volts when the load current changes about 60mA. Here is the schematic diagram of the circuit: The basic principle of the voltage regulation rely on the mechanism of keeping the the […]
Read more