This 1969 circuit generates a high voltage that reaches 100 V from 16 V. The power is of the order of 280 mW. The number of diodes determines the voltage multiplication.
This circuit was found in 1980s American documentation. The transducer is a piezoelectric capsule and the...
This is an improved circuit from the earlier version also found in the April 1972 Radio...
The sensor for this alarm is an LDR and it consists of an oscillator that goes into action when...