Transistor tester circuit

185

01:40:46

The 555 operate at 2Hz. Output pin 3 drives the circuit with a positive then zero voltage. The other end of the circuit is connected to a voltage divider with the mid-point at approx 4.5v. This allows the red and green LED's to alternately flash when no transistor is connected to the tester. 

If a good transistor is connected, it will produce a short across the LED pair when the voltage is in one direction and only on LED will flash. If the transistor is open, both LED-s will flash and if the transistor is shorted, neither LED will flash. 

published 10 years ago

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.