This circuit is built around an oscillator. When the transistor tests good, the oscillator will produce a tone in the speaker.
Parts List
Unless otherwise stated, resistor wattage = 0.25W.
- R1 = 150Ω
- R2 = 220KΩ
- R3 = 150KΩ
- C1 = 100nF
- C2 = 47nF
- D1 = 1N4148
- T1 = BC557
- T2 = BC547
- SW1 = DPDT switch. (Double pole, double throw.)
- LS = loudspeaker 8Ω
Son düzenleme: