Using the LM3914 this unusual digital clock uses a Bargraph LED indicator. The LEDs are the segments of a 7-segment display. We found it in February 1980 Radio Electronics magazine.
The gain of this alternating voltage amplifier is 100 times, depending on the 1M-ohm resistor, which...
This simple field strength meter is from a transistor book from the 60's. The transistor is made...
We found this circuit in an 80's Electronic Design. It makes use of couplers of the time that can...