555 audio simple ohmmeter circuit
This is 555 audio simple ohmmeter circuit. Some times, we need to measure roughly resistances only. we can know resistances by audio also fast check. […] Read more
Simple Frequency Divider using one transistor BC549
If you looking for simple frequency divider circuit. This may be suitable for you. It will divide a frequency of input signal into just half to output. Read more
Three bounceless switch circuit using digital IC
The simple bounceless switch circuit. It is one kind of electronic switches, high quality, and low noise. They are suitable for the digital circuits. Why? Read more
5 circuits of 555 Alarm sound and tone generator
This is Simple 555 Alarm sound circuit, for beginner as buzzer sound. IC1 is pulse generator, to transistor PNP for boost current to speakers. Read more
2 Headlight Warning buzzer reminder circuit
Often drivers forgot to turn off lights when parking. They cannot start the machine, ran out battery. This Headlight Warning buzzer circuit can help. Read more