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.
This circuit was obtained from Radio Electronics from the 90s. The infrared sensor is of an...
This circuit is from the 1993 Motorola Linear Interface ICs. The circuit must use symmetrical power...
This circuit was found in the magazine of radio amateurs 73 in a 90's edition. The components are...