2N3055 used to make a HQ stabilzed Voltage supply 1-4 Amp. on 12.2 Volt out with a 7812 schem/demo

[@iceberg789]

there is a "High Current Voltage Regulator" schematic in lm7812 datasheet, with a pnp transistor ( 2N2955 for example )

[@radiofun232]

Yes, I know, good info.

[@johnwynne-qx6br]

Useful and interesting information 👍

[@radiofun232]

Thanks.

[@roncaruso931]

Very nice circuit and your demo. I did not know about the diode in the circuit.

[@radiofun232]

Thanks Ron. Yes, that diode is crucial. For a somewhat higher output voltage you can take more of them in a row, say 3 of them.

[@perttisalonen850]

Very good! Thank you for the description and schematic of the circuit. Is it possible to substitute the positive 12V regulator 7812 with the adjustable voltage regulator like LM317? This was a good, though short demonstration.

[@radiofun232]

Yes, that is also possible. Though the LM317 sets its output voltage via a resistive voltage divider. Does not have to be a big problem, though resistors are (in theory) temparature sensitive. But such a 7812 is that also, in a certain way.....Like all semiconductors. Anyway: it seems (to me) a good idea that in case of a LM317 metal film resistors have to be/can be used. Thanks, 4 dec. 2024.

[@CoolDudeClem]

Interesting circuit. I wonder if something like this could be done for the LM317?

[@radiofun232]

Thanks, I will upload a schematic/demo (where I will use the LM 317 in such an application) within a few minutes. 5 dec. 2024. I was (also) very interested in that option.

[@SeAfasia]

nice idea.....Ko can you add more 2N3055 back to back connection?

[@radiofun232]

I don't know what you mean exactly with "back to back" but you can parallel another 2N3055 to get more current out. The amplification factor of the second 2N3055 must be the same. When it is not the same (=slightly differs) you can adapt the base current of the 2N3055 with the highest amplification by soldering a series resistor in its base lead, with a value (normally in the 10 Ohm-1 K range) that has the effect that the currents (C-E) of both 2N3055's are the same (measured with a DC Ammeter), given a certain load. Thanks. 4 dec. 2024.

[@SeAfasia]

@@radiofun232 thanks Ko....

[@bblod4896]

Nice circuit and demo. I guess if I wanted to increase the voltage to perhaps 13.8 vdc, I would add a few more diodes in series.

[@radiofun232]

Thanks Barry and yes, that is the solution.

[@RobbyMatthias]

Nice video,Ko!Getting 'hi-amps' out of a regular 'voltage-regulator'(7800,7900 series')is a bit of a challenge!They generally max-out at (800mA)!Would be interesting to put a '2N3055 onto the output of a smaller, 'transistor-amp' for class-A output.An easy way to increase the output power. Btw;Which diode are you using?Looks' to be fairly high-voltage/amperage?

[@radiofun232]

Thanks & yes, at the moment I am working on a circuit where a LM317 drives a 2N3055 directly. Hope it will succeed! NB: I always use the 1N5408 in these cases (1000 V-3A). Of course not always necessary.....(same price as smaller current diodes....).

[@davidfalconer8913]

The 2N3055 is an excellent transistor ... but .... to mount it , you might need an old broken one as an ACCURATE drilling template .... modern transistors just use ONE hole ( anyone ( ? ) can drill this 😝 ) ........... DAVE™🛑

[@radiofun232]

Yes, good idea! I often use (for drilling) such a small isolation (mica or silicone) plate, as a template. And yes, that drilling for a 2N3055 is somewhat critical.