a 723regulator for ASM1 question

[Harry Bissell]

The 723 regulator usually has a pot where the voltage can be set precisely.
7815 / 7915 is luck of the draw, within the regulator tolerances.

Shame on designers who rely on the supply as a precision reference. That's
what (er....) precision references are made for.

But if absolute voltage is not critical, the 78xx /79xx are usually OK.

723 also excells as a driver for a series pass transistor, so most higher
current
supplies use this chip. An oldie but a goodie.

H^) harry

danial stocks wrote:

> >Im building a 723based reg. im using the 723datasheet schematics.
> >its a +15 -15 0 reg.
> >
> >one of the parts is a 2n4898 which i didnt find yet.
> >instead iv been given a bd224c (looks like the 7815 part box figure)
> >
> >is the bd224c a good replacement for the 2n4898 in the case of asm1
> >regulator?
> >
> Hi.. I thought the 723was a simple single supp adj reg, but I thnik you can
> ste it up for dual rail.. Generally if a trans has = or higher current
> rating, power diss and similar gain, you can substitute it..[watch out for
> pinout variations tho..
> I have on occasions simply retrofitted complex ccts like this with a simple
> 7815/7915 combo and it works well.. [did this in a TR808, havenit tried in
> ASR-1] but one thing to note is that there may not be any real advtg to the
> more complex cct, just that the particular engineer didnt know of the 3 term
> regs or they simply didnt exist at the time.. this is particularly the case
> with really old stuff. In a newer equip maybe there is a reason, I'd stick
> to the original cct ..
> Cheers,
> Dan
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