This 1969 circuit uses a 117 V filament tube powered directly by the power grid. The original circuit makes use of a charcoal microphone, a common component at the time.
This sensor circuit was found in an American 1980s documentation. Modern operational amplifiers can...
This treble and bass control drains some milliamperes from a 12 V supply and can be used with any...
January 2017 - Texas Instruments' new TPS7A19 Low Voltage Dropout (LDO) linear regulators are now...