UCD 180 input buffer

rotation · 27th September 2006, 04:07 PM

Hi!
I will order the UCD 180 modules without op amp. I would like to know if it is possible to ad separated, maybe discrete op amp. Anyone experienced this?
Thanks Miha

RX5 · 27th September 2006, 04:23 PM

hmmmmm I have not seen a discrete "op amp" YET..... not even close to a 741...

BWRX · 27th September 2006, 04:26 PM

No doubt it could be done, but you would need some kind of SO8 adapter to make that work.

rotation · 27th September 2006, 04:35 PM

Quote:

Originally posted by RX5
hmmmmm I have not seen a discrete "op amp" YET..... not even close to a 741...

I've made and used discrete op amp in preamps that sounds much better then integrated. Examples are 990, 2520, Melcor...

Where is placed op amp in UCD? Is it soldered directly to pcb or not?

RX5 · 27th September 2006, 05:43 PM

i think it IS the small board in the main board of UCD....

BWRX · 27th September 2006, 07:12 PM

The input buffer is an SO8 op amp. The upgraded modules use the AD8620.

That daugther board is the top secret modulator circuit, hence the potting.

RX5 · 28th September 2006, 02:07 AM

Quote:

Originally posted by BWRX
The input buffer is an SO8 op amp. The upgraded modules use the AD8620.

That daugther board is the top secret modulator circuit, hence the potting.

so thats where it is

RX5 · 28th September 2006, 04:50 PM

Brian,

MPSA92(on daughterboard).... for?

rotation · 28th September 2006, 05:38 PM

Thanks for the replys. I think i will keep the NE5532 and use my own power supply. NE are ok, i used them for many preamps compressors..I listened to some tests with AD8620 vs NE5532 and i would say the AD is too bright, enhanced in some way. They wouldn't go with studio monitors i use.
Miha

BWRX · 28th September 2006, 06:38 PM

I don't know exactly what the MPSA92 is for. I only read that the daughter card contains the UCD modulator circuit components, so it's certainly part of the modulator circuit.

NE5532s sound ok in my op amp preamp, but I like the sound of the TL072s better. That would be another very cheap option you could try.

27th September 2006, 04:07 PM	#1
rotation diyAudio Member Join Date: Oct 2005	UCD 180 input buffer Hi! I will order the UCD 180 modules without op amp. I would like to know if it is possible to ad separated, maybe discrete op amp. Anyone experienced this? Thanks Miha

27th September 2006, 04:23 PM	#2
RX5 diyAudio Member Join Date: Apr 2004 Location: TaC	hmmmmm I have not seen a discrete "op amp" YET..... not even close to a 741... __________________ RoCk On!!! I love my diy UcD!!

27th September 2006, 04:26 PM	#3
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	No doubt it could be done, but you would need some kind of SO8 adapter to make that work. __________________ Brian

27th September 2006, 05:43 PM	#5
RX5 diyAudio Member Join Date: Apr 2004 Location: TaC	i think it IS the small board in the main board of UCD.... __________________ RoCk On!!! I love my diy UcD!!

27th September 2006, 07:12 PM	#6
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	The input buffer is an SO8 op amp. The upgraded modules use the AD8620. That daugther board is the top secret modulator circuit, hence the potting. __________________ Brian


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28th September 2006, 04:50 PM	#8
RX5 diyAudio Member Join Date: Apr 2004 Location: TaC	Brian, MPSA92(on daughterboard).... for? __________________ RoCk On!!! I love my diy UcD!!

28th September 2006, 05:38 PM	#9
rotation diyAudio Member Join Date: Oct 2005	Thanks for the replys. I think i will keep the NE5532 and use my own power supply. NE are ok, i used them for many preamps compressors..I listened to some tests with AD8620 vs NE5532 and i would say the AD is too bright, enhanced in some way. They wouldn't go with studio monitors i use. Miha

28th September 2006, 06:38 PM	#10
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	I don't know exactly what the MPSA92 is for. I only read that the daughter card contains the UCD modulator circuit components, so it's certainly part of the modulator circuit. NE5532s sound ok in my op amp preamp, but I like the sound of the TL072s better. That would be another very cheap option you could try. __________________ Brian

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