This 6W amplifier with 4 tubes was indicated in an American documentation from 1947 to operate with recorders. The circuit uses a source with a transformer.
This circuit is from a 90s Popular Electronics. It consists of a power source for bass amplifiers...
Using two common operationals, such as 741, this circuit serves as a medium control in an...
This is one of the many possible siren configurations for the 555 integrated circuit. We found it in...