Author Topic: LM324 Power Supply with variable voltage and current  (Read 72085 times)

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Offline mike_mike

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Re: LM324 Power Supply with variable voltage and current
« Reply #900 on: June 23, 2021, 05:18:47 pm »
I mounted all the components of the PSU into the case and I made a test and the PSU is working.
I used 3 transformers, one power toroidal 150VA/ 0-17-30Vac, the second 12Vac E+I for tap switcher, and the third, a PCB transformer 9V/2VA, for the digital voltmeter.
I would like to know what modifications should I made to the tap switcher if I want to use a more powerful relay, with 150mA coil current ? It is sufficient to replace the transistor from the tap switcher with a new transistor with higher Ic current ? The current relay is only 30mA coil current. Can I use a N-Channel MOSFET instead of the tap switcher NPN transistor ?
 

Online xavier60

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Re: LM324 Power Supply with variable voltage and current
« Reply #901 on: June 23, 2021, 10:00:25 pm »
You could use something with the same pinout like a BC337. Increase the Base current if it's not saturating properly.
Just about any N-ch MOSFET will work. I would use an IRF730 because I have a bunch of them and are not much use for anything else.
Hioki AS100D vom, HP 54645A dso, Fluke 87V dmm, AN8008 dmm, Agilent U8002A psu,  FY6600 function gen, New! Brymen BM857S-(With Battery)
 


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