This 2-tube amplifier was found in a Japanese publication of 1964. The circuit has excellent sound quality. The power supply is not given and must provide a voltage of 300 V.
This circuit can be used as a shield for the control of stepper motors from microcontrollers. The...
This circuit was found in a 1960s Motorola documentation. Transistors are types of the time and...
In the figure we have two possible configurations for multivibrators with relay. The idea comes...