This circuit was found in Philips documentation from 1969. The components are from the time including transformers that are commercial types.
This circuit consists of a Step-Down converter (voltage reducer) that can provide a 5 A output with...
This circuit is from an English publication of 1982. The bipolar transistor can be a BC548 and the...
The frequency of the sound produced in the speaker depends on the light that falls on the...