This temperature compensated circuit was found in a 1980s American documentation. The power supply is made with 5 V which allows its use as a shield.
This VCO or Voltage Controlled Oscillator was found in a Popular Electronics from 1991 but can be...
This simple circuit was found in Popular Electronics from 1992. The transistor is a...
This type of circuit is widely used in old cassette recorders and tape players, regulating the...