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B1 Buffer Preamp
B1 Buffer Preamp
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Old 1st October 2017, 01:42 PM   #4381
kinku is offline kinku  United States
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B1 Buffer Preamp
Quote:
Originally Posted by JPS64 View Post
You are using a Sealed led acid battery from pictures.Those noise measurements are from NiCad and Ni Mh batteries. Noise floor from LED cid batteries is not that low.
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Old 1st October 2017, 02:32 PM   #4382
JPS64 is offline JPS64  Germany
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B1 Buffer Preamp
OK, letīs go with NiCd/NiMh.

Listening with PASS HPA to Tingvall Trio will help.

JP
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Old 2nd October 2017, 05:47 PM   #4383
JPS64 is offline JPS64  Germany
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B1 Buffer Preamp
progress... will put charger electronic (all SMD) on dedicated small PCB.

External 30V supply is from Meanwell.

Remains a lot to do...

JP
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File Type: jpg B1-BUFFER-2U_V2_001.jpg (246.4 KB, 544 views)
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Old 3rd October 2017, 12:44 PM   #4384
JPS64 is offline JPS64  Germany
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B1 Buffer Preamp
LTC4010 NiCd/NiMH on separate SMD PCB...

JP
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File Type: jpg B1-BUFFER-2U_V3_001.jpg (229.8 KB, 483 views)
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Old 31st October 2017, 01:56 PM   #4385
soendervig is offline soendervig  Switzerland
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Default B1 balance control

I have been using the search function in order to learn more about the possibility of using a balance-control and a stereo potentiometer or attenuator .
What i have found is a consensus that two mono controls will suffice , in some cases a stereo volume control is favoured over the possibility of adjusting balance alltogether . Well , i would like to be able to adjust balance without fiddling with two knobs at the same time . My problem is that i can't seem to wrap my head around how to do the wiring . It is probably very simple , and once i get my nose pointed in the right direction , i'll likely bang my forehead with something heavy . My appologies if this subject has allready been discussed in depth , i just haven't found it yet . Hoping for and thanking in advance for a helping hand ,

cheers

Kim
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Old 31st October 2017, 05:34 PM   #4386
Nelson Pass is offline Nelson Pass  United States
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B1 Buffer Preamp
Post a drawing and someone here will criticize it for you.

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Old 31st October 2017, 05:37 PM   #4387
troystg is offline troystg  United States
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Post a drawing and someone here will criticize it for you.

Spoken like a true professional....
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Thinking positive doesn't make things better, it makes you a better person.
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Old 31st October 2017, 06:27 PM   #4388
kpsthakur is online now kpsthakur  India
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Quote:
Originally Posted by soendervig View Post
I have been using the search function in order to learn more about the possibility of using a balance-control and a stereo potentiometer or attenuator .

What i have found is a consensus that two mono controls will suffice , in some cases a stereo volume control is favoured over the possibility of adjusting balance alltogether . Well , i would like to be able to adjust balance without fiddling with two knobs at the same time . My problem is that i can't seem to wrap my head around how to do the wiring . It is probably very simple , and once i get my nose pointed in the right direction , i'll likely bang my forehead with something heavy . My appologies if this subject has allready been discussed in depth , i just haven't found it yet . Hoping for and thanking in advance for a helping hand ,



cheers



Kim


Please check your PM
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Old 1st November 2017, 11:34 AM   #4389
soendervig is offline soendervig  Switzerland
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Join Date: Oct 2008
Location: countryside
Default B1 balance control

Thank you Nelson and Kpsthakur for responding

I have given the matter a lot more consideration and decided to complete the first B1 the way it was concieved by the Maestro . I've had two Khozmo mono attenuators sitting around for the longest time and it would be a shame not to put them to good use . That way i can keep wiring as short and uncluttered as possible as well . That said , i have another Passdiy pcb and fets-kit in the drawer and i 'll use that for further experimentation at a later stage .
I'll try to educate myself more on the subject ; after all i can read a set of line-drawings and a table of offsets and build a boat from there . Darned if i shouldn't be able to figure out some wiring as well

Cheers

Kim
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Old 1st November 2017, 12:11 PM   #4390
kpsthakur is online now kpsthakur  India
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B1 Buffer Preamp, but we will still like to see the schematics/pics...please be generous..it could be someone else who would also like to implement something similar.
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