This circuit was found in the 1992 Radio Electronics Handbook. It is used to test VCR recording heads. It can also be used for other purposes.
This circuit for several frequencies was obtained in an American documentation from the 90s. The...
The 2 uF capacitor used in this circuit must be of excellent quality with a minimum of leakage to...
When the 24 V battery voltage drops below 18 V, this circuit cuts off its discharge. The circuit...