This simple low current circuit was found in a Radio Electronics magazine from August 1960. The circuit does not use transistors in regulation, but only zeners directly.
In the figure we have the way to obtain an adjustable 1 to 10 mAconstant current source. The...
When powered by a 14 V supply this circuit source 5,2 W to a 4 ohm load. For a 2 ohm load this...
This 1992 circuit demodulates FSK signals by providing TTL-compatible logic output. The...