This small 1 W amplifier uses a Motorola integrated circuit from the 1970s. The integrated circuit used is uncommon today and the power supply does not have to be symmetrical.
Obtained from a 1967 documentation, this circuit uses transistors from the time. The galvanometer can be a...
Motors up to 2 A can be controlled by this circuit, which requires a symmetrical source. Although...
This sensitive MW receiver was found in a publication of year 1958., The circuit uses germanium...