DIY TT-185 TRANSISTOR TESTER (ships only to continental US states)
Have some TO-18, T0-92, TO-126 or TO-220 transistors lying around that you need to check? This handy little tester will check them. Solder the parts to the board and you're ready to go. Or buy the Assembled and Tested version.
HOW TO USE
Place the transistor to be tested into the correct socket. Make sure the leads go into the proper pins.
The board can be powered from 9-12 vdc. A 9v battery works great. Connect power to the screw down terminals.
There is a Green and Red LED on board. This is what they'll tell you:
1. No transitor in the socket. Both LED's will flash.
2. Only the Green light flashes if it is a GOOD transistor.
3. If both LED's flash, the transistor is OPEN.
4. If neither LED flashes, the transistor is SHORTED.
This is a quick and easy tester to use to find out if your transistors are good.
Note that on the PCB the left socket is for TO-90 (C_B_E) types and the right is for TO-220 (B_C_E) types. Just use the correct socket.
TO-18 type fits into the TO-90 socket and TO-126 type into the TO-220 socket.
DIY TT-185 KIT $15 (instructions included)
1 - PCB
2 – 8 pin DIP sockets
1 – 555 timer IC
1 – 2 pin screw terminal
2 – 1N4007 diodes
4 – 330 ohm, 1/8 watt resistors
1 – 33k, 1/8 watt resistor
1 – 10uf capacitor
1 – green LED
1 - red LED