This is a traditional 741 configuration with gain close to 100. We found it in the December 1972 Radio Electronics magazine. The power source must be dual.
This circuit was taken from old American documentation. The transistors used make it possible to...
This oscillator uses a general-purpose transistor that can have BC548, BF494 or 2N2222 equivalents and...
This circuit of a 73 American magazine from the 1990s can generate multiple frequency signals from the...