[sdiy] papareil Dual lin ADSR

[fmg]

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
.