This circuit was found in a Hands On Electronics from the 90s. The circuit does not need a symmetrical power source. The signals with which it operates are alternating.
We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the...
This circuit can provide constant currents adjustable between 1 and 10 mA. The transistors can be...
This 1980s circuit uses components of the era that can be replaced by modern equivalents. For the FET we can...