Archive for April, 2008
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 [...]
Mini drill revolutions, speed regulator circuit
With the help of this revolution regulator circuit you can control the number of revolutions of your drilling machine.
After you finish construct this mini drill revolution regulator measure the output voltage. First rotate P2 to the right completely, P1 to the maximum. Now the measured voltage must be 20% less than the maximum allowed [...]
Adjustable power supply 0 - 30V / 1A
This power supply deliver a cc voltage adjustable between 0 and 30V , a current intensity of 1A and has a built in programmable current limitation. The output current can be adjusted with P3.
Power supply first use adjustment:
Load the output with a 1k / 1W resistor, rotate P3 at minimum and adjust P2 [...]
