273
Fig. 3.68:
Circuit
68: LED blinker
1 Hz
Fig. 3.69:
Circuit
69: LED blinker
3 Hz
Circuits 68 and 69: the output is fed back to the base of T1 via R1. R2 and C2 ensure the time delay. If T2 is
electrically conductive, the feedback ensures that T1 also switches through. Then T2 begins to block. That in
turn also blocks T1. As a consequence of this, T2 starts to be conductive and so it continues.
Summary of Contents for ELECTRONICS EXPERIMENTS BOX
Page 4: ......
Page 265: ...267 Fig 3 56 Cir cuit 56 Audio limiter Fig 3 57 Circuit 57 Amplifier for a storm detector...
Page 269: ...271 Fig 3 64 Circuit 64 Stabilizer for 1 9 V Fig 3 65 Circuit 65 Stabilizer for 2 5 V...
Page 275: ...277 Fig 3 80 Circuit 80 Quiztimer 30 seconds Fig 3 81 Circuit 81 Handy diode tester...
Page 315: ...317 Fig 3 179 Circuit 179 HF generator 150 kHz Fig 3 180 Circuit 180 HF generator 420 kHz...
