This 2000’s circuit causes LEDs to flash sequentially from programming on an 80C51 microcontroller. The circuit has an additional TTL and must be powered by a 5 V power source.
We found this oscillator in a documentation for radio amateurs from the 1970s. The circuit can use...
Many oscilloscopes have high impedance inputs that make it difficult to observe high frequency signals...
This is the receiver for the previous circuit we found in the December 1992 Radio Electronics...