329
Fig. 3.208:
Circuit
208 – NAND gate
with LED
Fig. 3.209:
Circuit 209 – Active Zener
diode 4V
Circuit 208: The functioning principle is described on page 299.
Circuit 209 to 211: The level of Zener voltage is monitored at the base of T2. T1 will reduce current, if voltage
drops. The voltage drop via R2 decreases, the Zener voltage rises to its original value. The reverse process
takes place, when the Zener voltage increases.
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...
