Free electronic circuit design and schematic diagram
The requirement of a continuity tester is that its current should be small enough to not destroy the tested circuit. This simple circuit inject not more than 0.6 mA current into the tested path in the tested circuit. The schematic diagram describes all the circuitry of the circuit. This circuit is used to test if two point is electrically connected […]
Read more
Using this continuity tester circuit, a failure of PCB tracks be examined without looking directly at the tracks routing, which is can be very frustrating. The indication of this circuit is done by an audible alarm (a buzzer). This circuit can be used to indicate continuity below any resistance value up to 35 ohms by adjusting the circuit. To make […]
Read more
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 continuity tester not only show if a connection is continue or not, but also determine the range of its conductivity level. Here is the schematic diagram of the circuit: Finding wiring trouble is easier if we know the quality of the connection, and this continuity tester give rough estimation. Small transistors will be sufficient for this circuits since the […]
Read more
This is a Cable Reflection Tester circuit. This circuit can be used to check coax cable runs for shorts or even impedance mismatches. This circuit will send a pulse down the circuit, then the return signal can be checked on an oscilloscope. The distance can be determined by using this equation:distance = time x speed equations. Here is the schematic […]
Read more