Headphones output is essentially the same output point with line output except a buffer resistor is between them. Both points located after the output signal relay.
In case the HP output was shorted there would be no line output too.
The HP output in your photos looks recessed enough. Maybe the jack doesn't go in properly deep.
Thank you, Salas!
It's a bit weird, as the Jack fits into the recessed connector. (And, well, the HP-output-wires are connected, not as on the photo of the rat's nest (inside the pre).
I looked at the schematic to get an idea what I deal with, so, yes, it is supposed to either work or not work. Yet another glitch?
Will have to see on the board what's there, just not today.
It's a bit weird, as the Jack fits into the recessed connector. (And, well, the HP-output-wires are connected, not as on the photo of the rat's nest (inside the pre).
I looked at the schematic to get an idea what I deal with, so, yes, it is supposed to either work or not work. Yet another glitch?
Will have to see on the board what's there, just not today.
Has to go full in too. Is it for sure the right type of HP panel connector? There is variety beyond simple L,R, Ground. Anyway, check why there is silent HP connection in your leisure. No prior incident in this thread so we can only guess.
Thank you, Salas!
Yes, will do! (Probably tomorrow)
Everything seems to point at a failing connection due to my construction virtuosity. Haha. (Still better than smoking parts, isn’t it?)
Yes, will do! (Probably tomorrow)
Everything seems to point at a failing connection due to my construction virtuosity. Haha. (Still better than smoking parts, isn’t it?)
I took a deep breath today and looked into my DCG3 again.
This was (yet another) my DOH!-moment.
I used a shorting HP-Jack (as it did fit better than the classic one laying around), and yes, you guessed right. No wonder there was no music... Connected it with traumwandlerischer Sicherheit on the wrong side even though, when I decided to use this part, I really took care not to do that.
After a little solder-session, I got it all!
This was (yet another) my DOH!-moment.
I used a shorting HP-Jack (as it did fit better than the classic one laying around), and yes, you guessed right. No wonder there was no music... Connected it with traumwandlerischer Sicherheit on the wrong side even though, when I decided to use this part, I really took care not to do that.
After a little solder-session, I got it all!
Congrat. Myleftear, now that you can sit back & enjoy the music.
I have a couple of question for Salas:
(1) Is the DCG3 supposed to be on 24/7.
(2) With my present single transformer setup (117v primary, dual 15v output, 160va), you mentioned your concern about hum on sharing secondary by 2 DCSTB in previous post. Would it be better if I make a DC power supply with about 10k uf and feed it to the 2 DCSTB. I probably use separate bridge rectifier the B+ and B- rail.
Thanks.
I have a couple of question for Salas:
(1) Is the DCG3 supposed to be on 24/7.
(2) With my present single transformer setup (117v primary, dual 15v output, 160va), you mentioned your concern about hum on sharing secondary by 2 DCSTB in previous post. Would it be better if I make a DC power supply with about 10k uf and feed it to the 2 DCSTB. I probably use separate bridge rectifier the B+ and B- rail.
Thanks.
(1) It can stay on as long as you want. Although when it comes to temperature in about ten minutes or so its as ready as ever.
(2) Yes its better to share a raw DC source than an AC source between the dual DCSTBs. Needs to feed them at a circuit location after their rectifiers of course.
(2) Yes its better to share a raw DC source than an AC source between the dual DCSTBs. Needs to feed them at a circuit location after their rectifiers of course.
Given enough ventilation, I'd say you're good.
I first had a smaller but fatter heatsink, and replaced it with a just as fat aluminium angle (60/60 x10), ventilation is here although not ideal.
The Mosfets warm up below 30° above room-temperature... (with "standard" gain as in the build-guide)
I first had a smaller but fatter heatsink, and replaced it with a just as fat aluminium angle (60/60 x10), ventilation is here although not ideal.
The Mosfets warm up below 30° above room-temperature... (with "standard" gain as in the build-guide)
Good day Salas,
Thx for the advise on post#6707.
While waiting for the pf5102 from Tea, I did some digging and found my 18x2 dual output transformer. So, I have a decision to make :
(1) The 15v 160 VA transformer, which tested 16.68AC, fully loaded/connected to the DCG3 with music playing.
(2) The 18v 230 VA transformer, measured @20.53 AC unloaded.
They are both Piltron toroidal transformer.
Should I stick with the 15v as it is very close to the 17v threshold.
Thanks for your time.
Thx for the advise on post#6707.
While waiting for the pf5102 from Tea, I did some digging and found my 18x2 dual output transformer. So, I have a decision to make :
(1) The 15v 160 VA transformer, which tested 16.68AC, fully loaded/connected to the DCG3 with music playing.
(2) The 18v 230 VA transformer, measured @20.53 AC unloaded.
They are both Piltron toroidal transformer.
Should I stick with the 15v as it is very close to the 17v threshold.
Thanks for your time.
I have a question. I have an enclosure which I d like to reuse. Several arrangement options are possible (mages attached). I haven't optimised the loop area yet, just preliminary thinking.
I use 50va 2x15v secondaries transformers.
Can I use the enclosure as a heatsink if it is made of 3mm sheeted aluminium?
And of 3 options which one is better?
In theory, I can order a separate enclosure for the power supply or just a larger one to keep all in one.
TIA
I use 50va 2x15v secondaries transformers.
Can I use the enclosure as a heatsink if it is made of 3mm sheeted aluminium?
And of 3 options which one is better?
In theory, I can order a separate enclosure for the power supply or just a larger one to keep all in one.
TIA
Attachments
Personally, I would go for option 3 as the transformers are further away from the preamp section.
I will second Freebee's suggestion for option 3. While playing with layout options I found the DCG3 board is susceptable to hum pickup from the toroids if they are in close proximity. Is that a 1U chassis? My experience with the 1U x 280mm Galaxy chassis was that the side rail was an adequate heatsink for 100mA bias. Warm to the touch, but within acceptable temperature rise for the FETs.
It is an enclosure from Ali, 3mm aluminium throughout except the front face. 60mm headroom.
I think I will use an aluminium angle as a heatsink, bonded to the floor or side + thermal grease and screws.
I think I will use an aluminium angle as a heatsink, bonded to the floor or side + thermal grease and screws.
