Electronic schematics, circuit designs
12V dc - 220V ac converter
CMOS 4047 is the main component of this small converter wich transforms a 12V dc into 220V ac. 4047 is used as a astable mutivibrator, at pins 10 and 11 will have a symmetrical rectangular signal wich is amplified b 2 Darlington transistors and finally reach the secondary coil of mains transformer ( 2×10V / 60VA ).
At the main coil terminals will get 220V. With the help of P1 the output frequncy can be adjusted between 50Hz to 400Hz.
12 V dc - 220 V ac inverter schematic:
Read the rest of this entry »
Liquid detector, water sensor
This is a very simple liquid detector that use a relay to open an evacuation van. You can use it for water or any liquid that conduct electricity. Use any PNP transistor that can stand the relay current.
Read the rest of this entry »
Electronic Metronome circuit schematic
This metronome schematic is not modern but is cheap and reliable. The well known 555 is presented in this metronome circuit and produces regulated impulses wich can be heard at a speaker. The metronome frequency can be adjusted with P1. The power supply is a 9V battery and if you use a 8Ω speaker insert a 33 - 100Ω / 1W resistor in series.
Metronome design:
Read the rest of this entry »
