Circuit diagrams and schematics - Electronic projects

This Circuit helps in the monitoring of mains supply voltage. It does not use a isolation step down transformer. This has to be constructed only by skilled people with knowledge of safety requirements. C1 0.47uF can be brought down to 0.22uF for low LED currents, use high efficiency ultra bright LEDs.C1 should be 440V AC [...]

When you want band pass Filter Frequency circuit 1KHz size in model easiness. I begs for to advise this circuit , because it uses , IC LM324 OP-amp highly popular the one number. By this circuit Filter frequency 1kHZ especial can change only. By we can can fix with R1,C1,C2 , and R2. Lay vacate [...]

This be LED display circuit , that interesting. By it will wink to alternate between LED the red and LED the green. This circuit can work with IC LM324, by part of IC op-amp 4 pcs. number LM324 cheap build origin waves square circuit comes out 1 cycle per every second. For LED one by [...]