This NEC commercial amplifier was manufactured in Japan in the 1960s. The circuit uses 4 transistors from the time and was powered by a 9 V battery voltage formed by large batteries.
Found in an old Xicor documentation, this circuit makes use of an X9241, which contains four...
Once the voltage in the load is adjusted, this circuit keeps the voltage constant through the...
This very low frequency oscillator was found in a Popular Electronics from the 90s. The circuit...