The circuit shown is based on National Semiconductor buffers and was found in the 1994 Linear Applications Handbook. The font must be symmetrical.
With this circuit it is possible to use a frequency meter as a tachometer. The circuit was found in...
I got this circuit from an English magazine from 1977. It can still be easily assembled, as the...
This circuit is from an April 1991 Radio Electronics magazine. The circuit uses power MOSFETs and...