Hi there, this is my buffer which I've designed to use with Hypex UCD 400 OEM. I needed it recently as on-board buffer with TL072 is not-so-good quality and I intended not to touch amplifier board to leave it unmodded.
So here are properities of these buffer boards:
- OPA1612 SO8 op-amps, nice and clean op-amps for this application, more expensive than LM4562 though,
- Hypex HNR / HPR12 regulators on-board
- Vishay MELF 0,1% precision resistors everywhere, impedance resistors additionally paired.
- Molex / JST / goldpin connector sockets for best electrical connection
- Design closely follows genuine Hypex NC500 OEM layout
- Very compact, directly installed on 2x18 pin row of amplifier
- Accepts balanced and single-ended signal
- Gain setting with 1 resistor
- Directly compatible with SMPS40 AUX output
What do you think about it?
Damian
So here are properities of these buffer boards:
- OPA1612 SO8 op-amps, nice and clean op-amps for this application, more expensive than LM4562 though,
- Hypex HNR / HPR12 regulators on-board
- Vishay MELF 0,1% precision resistors everywhere, impedance resistors additionally paired.
- Molex / JST / goldpin connector sockets for best electrical connection
- Design closely follows genuine Hypex NC500 OEM layout
- Very compact, directly installed on 2x18 pin row of amplifier
- Accepts balanced and single-ended signal
- Gain setting with 1 resistor
- Directly compatible with SMPS40 AUX output
What do you think about it?
Damian
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Looks really nice! I was thinking of the ucd400oem for a while as you might recall. I now trying to design own boards for the UCD250LP instead, because that was the modules i happened to get my hands on. Do you think it would be possible to share one set of regulators on multiple boards? I'm thinking that the return feedback (or whatever it is called) from the caps should help minimizing the negative effect of the longer distance.
And its hard to see on your image of the bottom layer, but are the negative speaker out connected to GND-plane or is it on a separate trace?
And its hard to see on your image of the bottom layer, but are the negative speaker out connected to GND-plane or is it on a separate trace?
'negative' LS output is bonded to GND plane. It is physically bonded to GND at the amplifier output.
I was also considering one HxR set for both upper ways but after some consideration I opted for separate regulator for each way. Not cheap but it is independent for each ampliier module.
I was also considering one HxR set for both upper ways but after some consideration I opted for separate regulator for each way. Not cheap but it is independent for each ampliier module.
Ok, I have to rethink a bit on the usage of gnd of my boards. So the input gnd, power supply gnd and loudspeaker "negative" are connected to the same gnd plane then?
Yes I now realize its not the best idea to use the HxR regulator sensing connections when feeding different coupling caps with different wire length in between, wire impedance mismatch a.s.o.
Yes I now realize its not the best idea to use the HxR regulator sensing connections when feeding different coupling caps with different wire length in between, wire impedance mismatch a.s.o.
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