301
Fig. 3.138:
Circuit 138: output level
Mixing console
Fig. 3.139:
Circuit 139 – Electrometer with
LED
Circuit 139 and 140: The two transistors configured as Darlington pair feature a very high input resistance.
This creates a high voltage drop even at very small input current, this in return switches the transistors
through and LED1 is turned on.
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...
