This simple moisture meter circuit uses for level moistness temple of the earth. Fine the value R2 give Meter read the value has 1mA. When the moistness
Tag: 2N2222
Today I would like to introduce the simple and economical simple siren circuits. It is suitable for beginners. My son will gradually build this circuit onto the PCB layout. Look at below! 4 Circuits.
Here is five burglar alarm circuits for you can look as idea To protect their property from thieves. simple switching, vibration systems, touch-sensitive.
These circuits are Simple Metronome circuit model to be simple. It use the transistor be important equipment by very the circuit is the character Astable Multi vibrator. For produce something the sound beep. Simple Metronome circuit using transistors We can adjust VR1 for get sound tone Generator follow can want. A loudspeaker that use to is supposed to impedance 8 – 32 ohm railing land. For decrease the popularity will down and may lead , output , go to feed reach still the amplifier microphone has changed , capacitors 10 uF. The detail is other , see in the circuit. …
use Mini high voltage generator at my friend wants. Because of use the transistor 2 pcs only just,build small-sized easy good. By this circuit gives pulse Generator 220V from 9V batteries and Give pulse voltage tall arrive at 170V from the 1 dry piece cell(Batt 1.5V) we should do circuit this experiment with neon lamp lead builds serial change Resister 1M at output of T1. Which choose lmodel 220V : 6.3V small-sized about 0.25A. Friends of I tells this circuit has applied to is the electricity or prevent steal. But should be careful specially , because be high class voltage …