Hi everybody,
I'm tweaking a CD723 in a low-cost way for pleasure. I Just have another PS for the AOP (maybe a 2604 cause i have it or another if I go with passive I/V between AOL/R and Vref. Don't want to go with discrete here...
I plan to feed the TDA1545a like that on the original PSU (in red: added parts): main powersupply/diodes -> 4700 uf standard -> 0r7 -> 7805 reg with a diode to adj (=5,6 v) ->
100 nf MKT -> 100R (to make resistive output?) ->
1F supercap (esr=30homs; ripple killer? & as a virtual batery to flat impedance curve) ->
very low esr cap 47uF (smd Panasonic SEPC : hope to be as good as larger SEPC Sanyo can type?) at the pins of the TDA 1545a... perhaps with
100 nf smd ceramic (or/and 10 nf ?). (the rail is + 5,5 V)
Is it good to do the same for Iref (same reg but feed TDA via 15k R -> 47 uf -> 10k R -> Iref (pin) ?
May-be a pi between the 4700 uF / 07R with > 6000 uF very low esr computer board style sanyo AF before the 78005 reg ?
In my non tech "brain", the supercap is like a firewall and a big source without ripple for feeding after the low esr 47 uF cap which supply tda1545. Is it good or the original simple 200 uF is enough ?
I just want to use caps, resistor or mini inductor like Neosid...?!. I will just change the diodes for ultra fast and remove their original // caps.
Thank you in advance for your inputs for "my ultimate cd723 3 bucks tweak"
, my main source is a DAC with a streamer. I would like a redesign to cost here
.
cheers,
Eldam