[sdiy] papareil Dual lin ADSR

[harrybissell]

Yes !!!

The large electrolytics are a must here. In fact... yuo would prefer
'bad' electrotlyic caps... ones with HIGH ESR.  The series resistance
would help damp the circuit.

You would need a reall large current spike to "ring up" the inductor...
but if the locak capacitance was not enough, the overshoot could be
outrageous !!!

I play with inductors in the low nH to uH range... but currents of
hundreds to thousands of amps... Overshoots are an 'end of life' if not
handled correctly

H^) harry

fmg wrote:
> 
> harrybissell wrote:
> 
> > [...]
> 
> > The inductor and the capacitor after it... might also resonate at some
> > frequency
> > and make the problem worse.
> >
> 
> Much worse...
> 
> I use inductors every time I can in my projects (I build them all) but a thing
> I recommend is not to use them for filtering in a power rail *without* an
> electrolytic attached immediatly after it.
> When the case is that...that the circuit already has decoupling caps associated
> to TTLs, 555s or other 'transient-by-short-circuit generators' these devices
> takes charge from the capacitors for a short period of time in a manner the
> inductor really really really dislike.
> Under this situation the inductor feels this is a bad environment and invoke bad
> spirits to ruin everything. (I mean high voltage here... and everywhere)
> The electrolytic works in this case as a contention for its bad attitude. Its not
> a very common situation.. but happens. Other than that it performs very well for
> the purpose, and personally I... but... what I'm saying ?
> 
> <pause... looking at Bareille's schematics>
> 
> Ok, there are no 555s, TTLs or transistors sinking big currents and the
> electrolitycs are there, thats good.
> For that schematics I would use a pair of 1.5mH and change the 10uF capacitors for
> 470uF. I would also use reverse diode protection for the coils (in parallel with
> the electrolitycs) and for back-discharge in the regulators (if they are 7XXX)
> All this means more pcb space than expected but also means less PS impedance and
> less waste of power (than if the inductors were replaced by resistors).
> 
> Frederic: In part of your original post you said that your modular 'grew'. Just...
> did you let your PS grow accordingly ? ;-)
> 
> Fabio
> .