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Making balanced output from single end
Making balanced output from single end
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Old 14th June 2019, 02:52 AM   #51
PRR is offline PRR  United States
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Quote:
Originally Posted by DouglasSelf View Post
... Looks like the dbx 160 came out in 1971....
I think a decade later. 1980s.

HiFiEngine notes the 165 as 1981. They have a scan of the binder-manual; mine came with the later pamphlet manual. IIRC (I'm not doing well with that) there was a description of this fancy circuit in the manual, implying it was a new thing.

The 160 (basic single-ended output) may have come out in 1976:
Morrisound Recording >> DBX 160 & 165
dbx (company) - Wikipedia
160A | dbx Professional Audio
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Old 14th June 2019, 05:14 PM   #52
DouglasSelf is offline DouglasSelf  United Kingdom
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From the schematic you posted it looks as though the dbx 160 did have a GC output.

160A | dbx Professional Audio says it appeared mid-1970s

This is where I got 1971 from:

Top 20 Best Compressors Of All Time - Page 9 of 20 - Attack Magazine

I found that convincing because the schematic has a very '1970' look to my eyes. However it is a bit confusing as one minute they say 160A then 160.

It would be nice to try and track this bit of history down. I imagine some of the people concerned with the dbx 160 are still with us.
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Old 15th June 2019, 01:52 AM   #53
PRR is offline PRR  United States
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> I imagine some of the people concerned with the dbx 160 are still with us.

That legacy moved to THAT Corp. Many of the 1970s people must be retired, but the THAT Corp people would/should know your name, share history, give you contacts.
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Old 15th June 2019, 06:37 AM   #54
MarcelvdG is offline MarcelvdG  Netherlands
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You can connect the input of this circuit to a balanced or an unbalanced source and the output to a balanced or an unbalanced load. It's basically an indirect voltage feedback (in Ernst Nordholt's terminology) differential amplifier with a weak and slow output common-mode loop. I built it for a local radio station that has a mix of consumer, semiprofessional and professional equipment. If the clipping behaviour matters, it may be a good idea to give the feedback differential pair a slightly higher tail current than the input differential pair, even though that degrades the distortion cancellation between them a bit.
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File Type: pdf schema.pdf (34.9 KB, 28 views)
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Old 15th June 2019, 06:50 AM   #55
EUVL is offline EUVL  Europe
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I would just use a Blowtorch and connect the input as single ended.
Performance almost same as balanced in.
John Curl's Blowtorch preamplifier part II
Post #98137

Or a Hornbeck Phrase Splitter.
phase splitter issue
post #148

All DC coupled.


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Patrick
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Old 16th June 2019, 01:09 PM   #56
Ken Newton is offline Ken Newton  United States
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Quote:
Originally Posted by xrk971 View Post
...Maybe another Howto thread is in order?
XRK, an thread on the manual PCB stuffing of fine-pitch and leadless SMD in particular would be a useful DIY resource. You obviously have developed the experience and technique required. Should you have the time, such would be much appreciated.

Last edited by Ken Newton; 16th June 2019 at 01:11 PM.
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