We found this micro amplifier in a technical documentation from National Semiconductor. The circuit can be used on an experimental phone, being powered even by alternative power sources.
This circuit with the HA2400 was found in the March 1980 Radio Electronics magazine. The circuit has...
Obtained from a 1980s Linear Technology documentation, this circuit has a hysteresis of less than...
This circuit published in the November 1964 Radio Electronics magazine powers a light bulb but can...