Found in a 90s Popular Electronics, this circuit provides a current of 3 to 5 A depending on the transistor.
In the figure we have a typical polarization circuit for MOSFETs with a high impedance...
Originally recommended to give a tone of transmission in equipment of the 60s (tubed) this circuit is...
Found in a 90s Popular Electronics, this circuit uses two PLL tone recognizers to trigger by touch an...