Archer Project Board Power Supply
This board provides 5 volt or 13.8 volt power. may be built up as a 5 v/13.8 v dual power supply. This board has LM317 and make a nice Laboratory bench supply. Thanks...
Running Lights with CD4017
The 555 Astable generates a clock for this circuit, an oscillator giving a square wave output at pin 3 which is counted by 4017 to give a running lights effect. Digital Timers Counters and...
Isolated Full-duplex Serial Interface
I would like to build Optoisolated RS232 interface. I’vesearched a little bit, and I came across your design:
Level Meter Circuits SPM-3 WG
Here are three circuits from the manual. The design is entirely on discrete devices like transistors, diodes and zeners. Studying these designs will reinforce your basics. It is easy to make things work with...
