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The 2SC5200 (npn) & 2SC1943(PNP) are nice linear gain power transistors and as such are popular with audio amplifier builders. I expect they could be useful in power supply circuits too. I have read elsewhere that good amplifiers and good power supplies have a lot in common.
Spec: this thread...
Its called Everycircuit.
It is free and available for PC's ( runs in Chrome browser ), iOS and Android. I use it on my Android tablet, Whilst its not as good as something like LTspice it can be more convenient to have on a mobile device.
Thanks for the compliment about the cat picture, she is...
This is a circuit that I've actually built and tested. I used a bd140 for the PNP and a tip3055 for the NPN, so should be fine with a 2n3055. I believe the circuit originated from one of the old National Semiconductor data sheets or app notes for the LM317.
TBH this was just a "fun" circuit demonstrating that something could be done with a minimum of components. I wouldn't recommend it for a serious application! :cool:
I do think MikeMI's addition of an emitter follower to drive the relay is an excellent augmentation, a low power MOSFET like a...
I tried this idea this morning. That is using a capacitive dropper ahead of the bridge rectifier & smoothing capacitor as a crude sort of pre regulator.
In the diagram shown the changeover switch would in fact be the contacts of a relay. At lower output voltages from a subsequent linear...
Hope you didn't think I was stealing your thunder! :p
You have taken the idea a step further in providing a means of ironing out any variations in the 1V25 references of the LM317 & LM337, I like this!
To avoid any issues with temperature or frequency instability I was thinking that the pre...
One thing that I've thought of but haven't tried yet is using an LM337 to provide the -1.25 V reference so the LM317 can go down to zero, two diodes would be cheaper, however I do happen to have a few LM337.
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