This simple 1-transistor audio preamplifier appeared in the June 1968 Radio Electronics magazine. The transistor is a general-purpose type of the time. The gain is 14 dB.
This circuit was found in a Electronics World of 1968. The integrated circuit is the MC1320P from...
Two inverters of a 4069B type CMOS integrated circuit form this oscillator which is characterized by having...
In the figure we have a way of obtaining a 13,2 V with current up to 5 A using an integrated 7812...