This preamplifier for phonographic capsules using FET was found in 90s American documentation. Consumption is very low. The power can be obtained from the amplifier circuit with which it works.
Found in American documentation from 1969, this circuit uses logic inverters to obtain sequences of 4...
This simple experimental circuit using only transistor produces a tone given by C1 and C2. Tone is...
According to the logic level applied to the input of this circuit, X1 is activated and X2 turns...