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 controls the temperature of heating elements, which may be lamps covered with...
Obtained in documentation from General Electric this circuit consists of a biestable with...
This low-pass filter with 741 op and symmetrical source was found in the August 1993 issue of...