This simple scr testor uses very few components but the main one is the 12 volts auto indicator flasher unit from a car. of which is what flashers your indicators, the socket to plug the scr into you can make by breaking down a large intergrated circiut socket, into a length that has 3 sockets for a 3 legged component .
You will get the idea by viewing the n channel mosfet testor of which the ic socket section for plugging the mosfet into has 4 sections insteatd of 3, but you only use 3. the extra one . disregard. it now3 this scr testor allso ,as i found out recently has a few good uses. and one is a reverse mode transformer testor , which puts out 2 pulses from a 12 volts input, one is the steped up voltage from the transformer the second is the kickback pulse from the indicator flasher units internal coil or relay coil.
by Steven
This simple scr testor , has some good uses and i used it to pulse test a transformer in reverse mode i got one good shock from the transformer and a small one followed , i beleave was the kickback pulse from the flasher units coil in the picture you see the scr plugged into a cut down ic socket, of which i used as an scr plug . just push the button for a short time to test the scr ,and once the relay activates and the led blinks on and off till the internal capacitor in the flasher units charge is drained . but as long as the relay activates and the led blinks you can still be asure the scr is working ok , as its part of the circiut.
You will get the idea by viewing the n channel mosfet testor of which the ic socket section for plugging the mosfet into has 4 sections insteatd of 3, but you only use 3. the extra one . disregard. it now3 this scr testor allso ,as i found out recently has a few good uses. and one is a reverse mode transformer testor , which puts out 2 pulses from a 12 volts input, one is the steped up voltage from the transformer the second is the kickback pulse from the indicator flasher units internal coil or relay coil.
by Steven
This simple scr testor , has some good uses and i used it to pulse test a transformer in reverse mode i got one good shock from the transformer and a small one followed , i beleave was the kickback pulse from the flasher units coil in the picture you see the scr plugged into a cut down ic socket, of which i used as an scr plug . just push the button for a short time to test the scr ,and once the relay activates and the led blinks on and off till the internal capacitor in the flasher units charge is drained . but as long as the relay activates and the led blinks you can still be asure the scr is working ok , as its part of the circiut.
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heres another one for scr testing i found on the net
