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Easy Transistor Tester

Easy Transistor Tester

4

7

2

3

IC1

NE555

8

6

1

5

4

7

3

IC2

NE555

8

6

1

5

3

T

Vcc

GND

RESET

+

+

+5V

GND

VR1

10K

VR2

47K

C1

22μ

16V

C2

0.01μ

R2

10K

S2

DPDT

NPN

PNP

C3

22μ

16V

R5

1K

R3

1K

VR3

100K

R4

120Ω


C4

0.01μ

S3

LED2

R7

330Ω

R8

330Ω

LED1

R6

10K

R1

1K

S1

RESET

B

E

C

C

B

E

T2**

SK100(PNP)

T1*

SL100(NPN)

TRIGGER

*NPN TRANSISTOR UNDER TEST

**PNP TRANSISTOR UNDER TEST

Easy Transistor Tester

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0
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publish time: 2020-09-25
Circuit Everyday

Use this circuit to determine whether a given transistor is good or bad before soldering. You can easily identify npn and pnp types, and the tester will indicate the location of the pins and the working conditions of the transistors with LEDs.

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