Update: 2.0 v.d.c. 1-amp regulated PSU: cct. diagram:
[attachment=4509]
Performance figures.
Load Vout Ripple (p/p)
N/L 2.0 -
750mA 2.0 10 mV
1.0 amp 2.0 20 mV Design full-load
1.3 amp 1.9 20 mV Design overload
Vout adjust range: N/L: 1.4 → 2.2 v.
F/L: 1.4 → 2.0 v.
Vout normal setting: 2.0 v.
Crowbar trip voltage: 2.25 v.
------------------------------------------------------------
Comments.
It's not the most elegant design I've seen, but then again, what were my design criteria?
1. Absolute minimum cost! It's not so much that I'm a miser: it's more a question of having accumulated a huge 'junk box' over the years, there comes a time when one has to do some pruning!
2. To produce a design that is reliable but not overtly complicated.
3. To specify parts of which I have ample spares (even the transformer!)
4. To meet a minimum performance spec.: 2.0v @ 1-amp. regulated & low-ripple being the 'design centre' spec. (i.e.: a traditional 2v accumulator, but one that never needs re-charging).
And with that . . . . your comments are cordially invited.
Aside: the HT 'battery eliminator' section will be discussed later.
Al. / April 10, 2012 //
[attachment=4509]
Performance figures.
Load Vout Ripple (p/p)
N/L 2.0 -
750mA 2.0 10 mV
1.0 amp 2.0 20 mV Design full-load
1.3 amp 1.9 20 mV Design overload
Vout adjust range: N/L: 1.4 → 2.2 v.
F/L: 1.4 → 2.0 v.
Vout normal setting: 2.0 v.
Crowbar trip voltage: 2.25 v.
------------------------------------------------------------
Comments.
It's not the most elegant design I've seen, but then again, what were my design criteria?
1. Absolute minimum cost! It's not so much that I'm a miser: it's more a question of having accumulated a huge 'junk box' over the years, there comes a time when one has to do some pruning!
2. To produce a design that is reliable but not overtly complicated.
3. To specify parts of which I have ample spares (even the transformer!)
4. To meet a minimum performance spec.: 2.0v @ 1-amp. regulated & low-ripple being the 'design centre' spec. (i.e.: a traditional 2v accumulator, but one that never needs re-charging).
And with that . . . . your comments are cordially invited.
Aside: the HT 'battery eliminator' section will be discussed later.
Al. / April 10, 2012 //
