This circuit was found in old documentation from Analog Devices. The integrated circuit is from the era. It has two settings and operates at frequencies up to 50 MHz.
We found this circuit in the Linear Applications Handbook published by National Semiconductor in...
In a September 1992 Radio Electronics article, we found this basic 555 circuit used to generate fixed...
In the figure we have a simple way to have a peak bargraph indicator. The amplifier is of the...