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.
The presented circuit makes use of operational ones that are not common in the market. More modern...
This circuit was obtained in a technical publication from the 1970s. It fires a diac and thus a...
This circuit, from a 1976 documentation, uses a low power MOSFET that is difficult to obtain, but...