Piezoelectric Buffer (CB21152E)

This circuit was found in American documentation from the 90s. It serves as an amplifier for a piezoelectric transducer.

Visually Impaired Electronic guide (CB17623E)
The circuit is quite simple, but its choice is due to the suggested application, which shows that...
Simple Alarm with SCR (CB24114E)
Found elsewhere in this section, this circuit is from the April 1971 Radio Electronics magazine. Note...
Parking Light (CB6333E)
We found this circuit in a Philips documentation from 1965. The circuit uses a common LDR sensor...