This circuit uses an unusual operational amplifier nowadays and has a very low consumption. The number in parentheses corresponds to the second channel, for a stereo version.
In the figure we have the astable configuration for the 4093 that serves as a clock for...
This circuit was found in Radio Electronics from the 90s. The circuit employs a transconductance device and...
VR can be from 50 to 220k it is recommended to connect a 100-ohm resistor in series. The lamp may...