Bilateral current source 2 (CB20819E)

We found this circuit in an American publication from the 1980s. Equivalent modern operational amplifiers can be used.

CMOS Output Zero Crossing Detector (CB14158E)
We found this circuit in the Linear Applications Handbook published by National Semiconductor in...
555 Fixed Period Generator (CB25498E)
In a September 1992 Radio Electronics article, we found this basic 555 circuit used to generate fixed...
LM3914 Peak Meter (CB24635E)
In the figure we have a simple way to have a peak bargraph indicator. The amplifier is of the...