This old fashioned transistor amplifier was found in a publication of the year 1958. Transformer are the critical components in the circuit and power comes from 6 D cells.
The more sensitive the instrument used the better the sensitivity of the indicated meter. We...
Published in 1988 in Hands On Electronics, this circuit converts the 12 V of a battery into 120 V AC...
This circuit, found in 2002 documentation, generates a strong audio tone when the light in the...