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 produces 1 kHz square signals using the CMOS IC 4070. The frequency is given by the...
This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be...
This circuit was found in the National component manual which is not currently simple to obtain....