[and now for something completely different part 3]

can someone please share the latest versions for gerber file links for:

- suitable PSU

- headphone amp

- volume attenuator (remote no necessary)

I was looking at the shared folder and I'm getting confused with the amount of duplicate files available.

I would also appreciate it if you can share a BOM. Thank you.

[paralleling 2 mechanical relay for a more "robust" relay? (speaker protection device)]

The speaker protection i have uses 2 relays for stereo channel (1 relay for each channel). But I'm thinking of using it in "mono-mode"  and shorting the R+L input and R+L output to make it more "robust". Will that work?

(this would mean I would need 2 devices for 2 channels.)

Thanks again

[Do I need volume control on preamp/headamp if my DAC already has one?]

As above. 

The 2 DACs I have already haa digital volume control which I believe are provided by the AKM/ESS chip.

Thanks

[and now for something completely different part 3]

can someone please share the link to the schematics/documents? I think it's a good drive link but I cannot find this link. Thank you.

[goldenreference low voltage power supply]

Thanks for the tip @Pars

I didn't know about that forum feature.

[goldenreference low voltage power supply]

On 7/19/2022 at 6:25 AM, audiostar said:

Answers are in the thread, why not read everything first? 

I am trying to avoid reading a novel if the answer can be easily/readily given

[Group Buy - Digital Attenuator (Kevin Gilmore)]

can someone please tell me the power requirements (transformer?) for a balanced version of this relay attenuator?

thanks

[some questions on the original "dynalo" PSU as mentioned in headwize]

On 10/1/2022 at 5:32 PM, luvdunhill said:

See Output section within the Electrical Characteristics in the OPA548 datasheet.

can you point out the specific/relevant section?

In Figure 13, it tells me the difference between Vsupply and Vout for a specific current output. And if wanting 2amps in Vout, the difference is only 3V. 24-16.4 is around 7volts. seems excessive considering I could've gotten better "efficiency" with a lesser Vsupply. 

maybe it has something to do with the fact that the voltage coming out of the recitfiers is so high. 48VDC all the down to 16.4V is a lot of wasted energy that needs to be dissipated.
 

[some questions on the original "dynalo" PSU as mentioned in headwize]

edit

[and now for something completely different part 3]

anybody has a spare PCB (enough for a balanced CFA3 and 1x GRLV)?

Thanks!

[The Multi Amp aka Dynalo Mk2]

On 3/3/2021 at 3:00 AM, Bespav said:

Try here:
https://www.ebay.com/itm/Toshiba-2SJ74-2SK170-Quad-0-03-4-9-11-bl-B-/253517005056?_trksid=p2349624.m46890.l49292

can you please share the seller name? the link goes nowhere now. Thanks

[and now for something completely different part 3]

On the left side of cfa3productionss.pdf, there's a schematic on the top right with a 2n4391. But I cannot find it in the cfp3rssfixedss and cfp3rssfixedsssw.

Any ideas? Thanks

[goldenreference low voltage power supply]

the latest gerber file seems to be goldenreferencelargecap.zip. but the AC input part seems to be very different from version 6.

seems the goldenreferencelargecap, AC input uses only 1 transformer secondary? Thanks

[and now for something completely different part 3]

if going for the split board, what's the input section? I am looking at the shared folder but it's not so obvious which one to get. Thanks

[and now for something completely different part 3]

(This is the gerber file I'm looking at => cfp3smt2splitamp - CADCAM.zip dated 2022-Feb-07 in the shared Drive folder)

- what's the minimum voltage I can use with the amp?

- I've been back-reading and I've read mentions of an opamp but I cannot find it in the PCB.

- average power consumption? (or shouldn't even think about it considering it requires massive heatsink? 😁)

 

Thank you.

 

EDIT1: The file I mentioned above does NOT have the transistor portion like what I've seen in other DIY pics. What Gerber file should I be using?

 

EDIT2: What's the difference between cfa3production.pdf vs cfa3productionss.pdf

[and now for something completely different part 3]

On 3/14/2022 at 12:29 AM, audiostar said:

Prior I start desoldering any components from my other boards, I thought I'll ask if anyone might need two fully populated (except Opamps and JFETs) wider boards. Not trying to make any profit, will sell at BOM cost, DM me if interested. 

 

what's the width of the PCB including the L-bracket? thanks!

[stax mafia circuit boards see updated links on page 5]

removed

[dCS Lina: 30k USD Headphone/Network DAC/External Clock Stack]

for $30+K, I expect it to be using something more than an Alps blue pot.

[The Multi Amp aka Dynalo Mk2]

Hi again, what's the use of U5 and U7? seems redundant with U2 and U3 already there. Thanks

[stax mafia circuit boards see updated links on page 5]

removed

[The Multi Amp aka Dynalo Mk2]

Hi all,

• what is the latest non-SMD PCB Gerber file? I am looking at the google drive site and I cannot find "kgdynalobalssproduction".
• - Can someone suggest a case for the Kerry SMD version?
• what's the recommended  copper thickness for the Kerry SMD version? I'm seeing the posts that suggest it should be a minimum of 2oz 

Thanks in advance.