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.
This microphone preamp allows the use of high impedance crystal microphones with amplifiers that have...
With a touch of S1 this circuit keeps a small strand of nichrome warm enough to light a cigarette....
Figure Bellow shows how to interface CMOS circuitos with TTL using the 4049 or 4050 IC. The power...