256
Fig. 3.33:
Circuit 33: Peak VU meter with coil-
moving instrument
Fig. 3.34:
Circuit 34:
LM antenna amplifier
for antennas with
longer wires
Circuits 32 and 33: The audio signal is rectified by D1 and delivered to the base of T1. If the threshold is
exceeded, T1 is electrically conductive, LED1 goes on or M1 shows deflection. Higher signal values result in
higher T1 collector current.
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...
