This is the receiver for the previous circuit we found in the December 1992 Radio Electronics magazine. The sensor is a photodiode that must have optical features such as lenses.
e find this circuit in documentation for radio amateurs of 1974. The unijunction transistor can be...
This is a traditional complementary-output transistor amplifier sourcing 2 to 4 watts to a 4 ohm...
This circuit was found in a 1980s documentation. The diode is general purpose. The circuit is...