Hi. Thanks I didn't know it was still open. I added my name for 3 PCB, 1xPSU, 1xSE-SE and 1xLHUP board. I guest I'll wait for the shipping cost and total to pay. I'm in Montreal, Qc
Thanks again
SB
Thanks again
SB
No worries!
BTW, the LPUHP is a mono PCB so one board may not be what you're after, just sayin'
Oups, I'll put two then. There is no volume pot on this design. What value is recommended if I want to add one at the input?
Thanks
SB
Thanks
SB
Hi!
I'm currently building overamped LPUHP thanks to multisync tips 😉
Sadly I'm facing an issue regarding the filter caps as I can't put the hand on 5600uf / 35V / 16mm diam. Those I bought are of 18mm diameter and won't easily fit on the boards. I could cheat a bit as we discussed with multisync but I would be more than happy with an easier way to go 😉
So question is: would that be a bad idea to use 4700uf / 35V caps instead of the 5600uf / 25V of the BOM ? (both are 16 mm diam.)
Cheers
I'm currently building overamped LPUHP thanks to multisync tips 😉
Sadly I'm facing an issue regarding the filter caps as I can't put the hand on 5600uf / 35V / 16mm diam. Those I bought are of 18mm diameter and won't easily fit on the boards. I could cheat a bit as we discussed with multisync but I would be more than happy with an easier way to go 😉
So question is: would that be a bad idea to use 4700uf / 35V caps instead of the 5600uf / 25V of the BOM ? (both are 16 mm diam.)
Cheers
Hi Neofeed,
You can keep the same 25V caps post regulator since the rails will be regulated to +/-22V and there is no risk of exceeding that voltage.
The two pre-reg caps need to be increased to 35V to cope with the higher unregulated voltage which will almost certainly exceed 25V.
In that case, just change the two pre-regulator caps to the 4700uF 35V parts you mentioned, and you're good to go!
Regards,
Owen
You can keep the same 25V caps post regulator since the rails will be regulated to +/-22V and there is no risk of exceeding that voltage.
The two pre-reg caps need to be increased to 35V to cope with the higher unregulated voltage which will almost certainly exceed 25V.
In that case, just change the two pre-regulator caps to the 4700uF 35V parts you mentioned, and you're good to go!
Regards,
Owen
Hi Owen,
Thanks for your answer.
If I sum everything up, that would be :
- Regulator Bypass Caps (C115, C116) = 35V
- Bypass Caps for Buffers (C1-C2, C5-C8, C69, C70, C99-C106) = 25V
- Bulk Filter Caps (C13, C14, C15, C31) = 35V
Am I correct ?
Thanks for your answer.
If I sum everything up, that would be :
- Regulator Bypass Caps (C115, C116) = 35V
- Bypass Caps for Buffers (C1-C2, C5-C8, C69, C70, C99-C106) = 25V
- Bulk Filter Caps (C13, C14, C15, C31) = 35V
Am I correct ?
Just a few question, sorry if they have been answered before. It shouldn't be a problem with the LME49610 but back with the LME49600 was the "15-16W" figure based on measurements or or just an estimate (11Vrms * 1.42Arms)? The datasheet doesn't explicitely specify voltage swing vs output current. The V(out) specification doesn't really help either because the output might be able to swing higher for peaks. Also the typical and limit values for negative I(out)=-100mA and I(out)=-150mA are swapped or just plain wrong so I'm a bit reluctant to trust the datasheet.
Hi guys,
I've built in the amps some weeks ago and I can't remember, how to connect the transformer's windings. I have the connections A/B and C/D on the other side. Is one winding connected to A/B or A/C?
Sorry for the question, but I want to prevent to get the amp out of the tight enclosure.
Many thanks,
Stammheim
I've built in the amps some weeks ago and I can't remember, how to connect the transformer's windings. I have the connections A/B and C/D on the other side. Is one winding connected to A/B or A/C?
Sorry for the question, but I want to prevent to get the amp out of the tight enclosure.
Many thanks,
Stammheim
Hi Setsul,
The 15-16W rating is based on the measurement shown in the second post in this thread. THD reaches 1% at 16W.
THD starts to degrade at around 10W but is still extremely low up to about 15W (0.1%)
Measurements for the V2 version can be found here:
http://www.diyaudio.com/forums/vend...-here-bal-bal-se-se-lpuhp-15.html#post3700321
Stammheim:
I need a diagram to comment. Please take the time to draw out what you mean.
Regards,
Owen
The 15-16W rating is based on the measurement shown in the second post in this thread. THD reaches 1% at 16W.
THD starts to degrade at around 10W but is still extremely low up to about 15W (0.1%)
Measurements for the V2 version can be found here:
http://www.diyaudio.com/forums/vend...-here-bal-bal-se-se-lpuhp-15.html#post3700321
Stammheim:
I need a diagram to comment. Please take the time to draw out what you mean.
Regards,
Owen
Thanks opc! So it wasn't a measurement artifact after all. The voltage swing might not be as bad as I expected if the rising THD+N is due to >200mA peak current. Not a definitive confirmation but at least something.
Please see following spitzte
An externally hosted image should be here but it was not working when we last tested it.
Hi Stammheim:
Thanks for the drawing. It helps to ensure less confusion. It should be:
A goes to 1
B goes to 2
C goes to 3
D goes to 4
Easy as that!
Regards,
Owen
Thanks for the drawing. It helps to ensure less confusion. It should be:
A goes to 1
B goes to 2
C goes to 3
D goes to 4
Easy as that!
Regards,
Owen
Many thanks, Owen!!!
Do you have any boards left?
I cannot believe you just enjoy listening to music, are you maybe working on an improved version of the LME49xxx boards??? 🙂
Do you have any boards left?
I cannot believe you just enjoy listening to music, are you maybe working on an improved version of the LME49xxx boards??? 🙂
More LPUHPs live - I finally finished the mirror image to the one that I posted a pic of a few months ago.
The transformers are antek 50VA units in their steel cases. Enclosures are from modushop. Aim was for compact case with reasonable separation between mains+transformer and the amp. The mounting for the amps on the walls is fiddly but looks neat in the end, I think.
Looking at an SE input to BAL-BAL headphone amp (which feeds LPUHP BAL signal) then the output of LPUHP into a 9R dummy load.
1k sine
1k square
(this wasn't built for standard gain, the gain is correct for this build).
The transformers are antek 50VA units in their steel cases. Enclosures are from modushop. Aim was for compact case with reasonable separation between mains+transformer and the amp. The mounting for the amps on the walls is fiddly but looks neat in the end, I think.
Looking at an SE input to BAL-BAL headphone amp (which feeds LPUHP BAL signal) then the output of LPUHP into a 9R dummy load.
1k sine
1k square
(this wasn't built for standard gain, the gain is correct for this build).
