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.
With this circuit it is possible to control a current of several amps, depending on Q1, from a low...
Programmable unijunction transistors are not commonly used components today. This Popular...
This circuit has a waveform adjustment made with a potentiometer. C1 and R1 determine the base...