pi filter & diode bridge ??
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L.K.S. Audio MH-DA004 Dual ES9038PRO DAC - Van Damme's double impact?
- Thread starter PitBul34
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You have made a mod so that the uln2003 chip does not directly control the relays, now they are isolated with optocouplers and I add a diode to each coil of the to protect the transistors of the optocouplers. Do I take power or GND in the analog source, I can't see it through the blu tack ballsHere is a riddle. What have I done ?
b0bb
Headphoneus Supremus
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Nicely done, very clean.New mod, attempt to raise the LT1763 to 1.3v (pin 2 disconnected from the pcb), in addition to changing the capacitors for other low noise ones suggested by B0bb, and I will comment if it works correctly.
If you reduce the values noise will go down.Perfect, values:
R1= 150k
R2= 9K1
Yes, I could do it, for example it's better like this:If you reduce the values noise will go down.
R1= 1K5
R2= 91R
Or even lower values?
you are right, very good.You have made a mod so that the uln2003 chip does not directly control the relays, now they are isolated with optocouplers and I add a diode to each coil of the to protect the transistors of the optocouplers. Do I take power or GND in the analog source, I can't see it through the blu tack balls
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I understand, my little doubt was that the original relays are 5vdc, and from what I see they have changed to 24vdc relays.tienes razón, muy bien. : xf_cool:
I expected that the bass would be even more transparent with this MOD than with the ferrite MOD.
But that did not happen. Instead the midrange became more transparent. Reverb and voices became much more transparent.
Elvis fever (take 1) 1960 blew me away. I've never heard his voice so clear.
The bass precision has remained of course. So another small step forward.
By the way, the fine cables are "star quad cables" made by myself. They help minimize inductive radiation.
But that did not happen. Instead the midrange became more transparent. Reverb and voices became much more transparent.
Elvis fever (take 1) 1960 blew me away. I've never heard his voice so clear.
The bass precision has remained of course. So another small step forward.
By the way, the fine cables are "star quad cables" made by myself. They help minimize inductive radiation.
Yes, PCN-124D3MHZ,001I understand, my little doubt was that the original relays are 5vdc, and from what I see they have changed to 24vdc relays.
https://www.mouser.de/ProductDetail/655-PCN-124D3MHZ001
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No fly-back diode (built-in uln2003) across the relay ?you are right, very good.
b0bb
Headphoneus Supremus
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This is missing from the schematic
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oh man, i was in a hurry
I think that's fine, how about you B0bb?Yes, I could do it, for example it's better like this:
R1= 1K5
R2= 91R
Or even lower values?
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