We found this circuit for video games in a Radio Electronics magazine from August 1977. The transistor can be any common RF type that reaches the desired signal frequency.
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...