This interesting circuit in which the LED display is circular imitating a common clock appeared in the Radio Electronics magazine of May 1977. The power supply is included.
This circuit has the transistor chosen according to the maximum current desired at the output. Unlike...
We found this configuration with CMOS-compatible output in the 1994 National Semiconductor Linear...
This very low frequency amplifier has a gain of 1,000 and was found in a 1967 documentation. The circuit is...