Yes, I suggested to Aleksandar to cut the board to make a version smaller than the “mini”. I noticed that the PCB layout allowed this. Furthermore, a piece of the transformers graphics remains, forming a nice “bridge” graphics that looks a bit like a logo (and it is on the side of the rectifier bridge, you see) so we went with it. I am also replacing the heat sinks with shorter ones, since the current I am drawing with that regulator is really really small.
I would like Adapterboard without a buffer and mono (1 separate for each 1ET400A module).
Of course with 1 PS for each module.
I want 2 mono blocs of Purifi
Or (?) do you think could it be possible to separate (cut) the current EVAL board in order to obtain 2 mono modules ? (with rearranging of the PS connectors) ?
Have a nice day
hmmm
"Or (?) do you think could it be possible to separate (cut) the current EVAL board in order to obtain 2 mono modules ? (with rearranging of the PS connectors) ?"
I suspect that would be ill advised, having the eval board here and looking at it. Tom C (neurochrome) seems to be pretty interested in making dual mono input boards, and they may have the option of bypassing the gain section, so they would probably work for you.
"Or (?) do you think could it be possible to separate (cut) the current EVAL board in order to obtain 2 mono modules ? (with rearranging of the PS connectors) ?"
I suspect that would be ill advised, having the eval board here and looking at it. Tom C (neurochrome) seems to be pretty interested in making dual mono input boards, and they may have the option of bypassing the gain section, so they would probably work for you.
I would like Adapterboard without a buffer and mono (1 separate for each 1ET400A module).
Of course with 1 PS for each module.
I want 2 mono blocs of Purifi
Or (?) do you think could it be possible to separate (cut) the current EVAL board in order to obtain 2 mono modules ? (with rearranging of the PS connectors) ?
I have considered this as well, but not to achieve dual mono. I was pursuing odd numbers of channels (1, 3, 5), in which case, I might need to save some width to fit a particular case. You should be able to cut away some of the right side of the EVAL1 without affecting the left side, but it would require care to preserve the shared traces. Until someone does it, successfully, you take a risk of ruining the whole board. You cannot save anywhere close to half the size. Maybe ~36mm if preserving the V regulators. I would not pursue multiple cut boards in a single amp.
Thanks a lot, I take a note ("it would be ill advised") and waiting for Tom's solution
You won't have to wait too long. I expect to have a prototype in hand and tested within two weeks.
Tom
I did my best to design a buffer that would be useful on its own and allow for tweaking (and not eat too much into Universal Buffer sales).
The Purifi/Hypex buffer will work with both the Purifi 1ET400A and the Hypex NC500. It is intended for use with the Hypex SMPS1200 (and future Purifi) power supply, thus will have the appropriate control connectors in addition to the 6-pin high-voltage connector.
The Buffer allows you to experiment with external voltage regulators should you so desire. The opamp power supply can also be passed directly from the SMPS1200 (or other supply) to the opamps. This is configured by jumpers.
The Buffer allows for the following gain settings (jumper selectable): 0 dB, 13.2 dB, and custom. With the 12.8 dB of the Purifi 1ET400A, you'll get 12.8 dB, 26.0 dB, and custom, respectively. "Custom" means you can set the gain by a resistor (same as for the Universal Buffer). The Buffer is based on the LM4562/LME49720 and features appropriate RFI/EMI filtering and ESD protection.
Also, should you prefer to use the Buffer board as a break-out board, you can disconnect the Buffer output from the NC500/1ET400A altogether by removing two 0 Ω resistors. I've provided a 3-pin connector footprint for you to solder wire to should you wish to go that route.
The Buffer has output for two LEDs: READY (supported both by the 1ET400A and NC500) and CLIP (supported only by NC500 as the 1ET400A does not bring out that signal). You can use any LED you'd like. The LED is powered by +12 V through a 3.3 kΩ resistor, so it'll work with a wide range of LEDs.
The speaker output is provided on rising cage screw terminals (same as on Modulus-86) and on 1/4" Faston/Quick-Connect spades. I've routed the remote sensing traces such that you get the full benefit of the remote sensing regardless of which of the two connector types you use.
The input is connected to a 3-terminal rising cage terminal block (same as used on my Modulus-86). The input impedance is 48 kΩ, differential. If you prefer a single ended input, connect Pin 1 to Pin 3. Connect Pin 2 to RCA centre, and Pin 3 to RCA shell (which should be isolated from the chassis).
The Buffer measures 2.50 x 2.50 inches (63.5 x 63.5 mm).
I don't have the price figured out fully just yet. I'm hoping to be able to offer it for around $100. Maybe $125 @ QTY 1; $100 @ QTY 4 or something. No promises.
The Buffer will only be available as a fully assembled module. The reason for this is simple: I can offer everybody better performance and lower prices by focusing on the fully assembled modules.
I expect to open for preorders in about three weeks.
Tom
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Again, outstanding. The day is here (well almost
) and I am very happy. -130 should be close to 0.000032% so completely in audible.
My goodness poor audiophiles.....0.03%, and likely 0.3% is already completely inaudible
, but off course the lower numbers will make you "feel" better
There is no local regulation. You can add that pretty easily, though. In fact, I'll offer an ultra-simple regulator board that will plug straight into one of the jumper blocks on the board. That board will be DIY and will support the Hypex HPR and HNR, as well as the LM7812/LM7912 and LM78L12/LM79L12.
The SMPS1200 by default comes configured to deliver ±12 V for the opamp. You can use that if you don't want to mess with regulators on the buffer board.
Tom
The SMPS1200 by default comes configured to deliver ±12 V for the opamp. You can use that if you don't want to mess with regulators on the buffer board.
Tom