Found in a 90s Radio Electronics, this circuit can supply currents of a few amps, according to the power transistor. The power transistor must be equipped with a heat sink.
This circuit triggers a low consumption buzzer when the LDR remains illuminated for more than the...
This circuit can be used in PLL, frequency synthesizer in FM and VHF receivers, reducing a...
This Japanese radio receiver is from the 60s. It has 6 transistors and is powered by 4 batteries with...