In circuit Transistor tester

[Gregory]

I have baught a Kit from Jaycar The kit number is KA1119
I have assembled the kit and I have tried testing a transistor in circuit but the reading showes faulty but when I remove the transistor from the circuit it then reads ok.
Can you help me with this problem.
Can I post a circuit digram of this tester.
Or can I take a photo of the circuit board and components and post it on the sight.if this helps.

 

[iONic]

Can I post a circuit digram of this tester.
Or can I take a photo of the circuit board and components and post it on the sight.if this helps.

Both Schematic and photo of your circuit would help. Post them in either .gif or .png format.

 

[RODALCO]

Try with a DMM in diode mode if you have one.

Normally for a quick test of a transisitor or diode in circuit you get a voltage drop of about 0.4, 0.5 or 0.6 volts across the junction. Even with a parrallel path through other components on the board.
If the transistor is shot, the reading is 0.0 - 0.1 volts across the juntion.

A photo would help from your tester and a schema if you have one.

Regards, Raymond

 

[Gregory]

Circuit digram and photoes

Could the switch 2 be back to front?
I have attached the photoes.

 

[Nigel Goodwin]

You need to be aware that this type of tester will only work under certain circumstances in-circuit, there are plenty of situations where the circuit configuration stops it working. I built one probably 25 years ago?, it was published in Practical Television magazine.