Search found 5463 matches
- Wed Oct 14, 2009 4:32 am
- Forum: Pro Audio Design
- Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
- Replies: 80
- Views: 353257
Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
OK, glad that worked out. For RFI filtering you might consider a series R and capacitive shunt ahead of the pot at the RCA jack. With the inverting input of the op amp unaccessible its difficult (impossible?) to put it in the feedback loop.
- Tue Oct 13, 2009 1:58 pm
- Forum: Pro Audio Design
- Topic: VCA theory question
- Replies: 36
- Views: 54483
Re: VCA theory question
Why not use the 4.98V directly - why scale it down? Like John I'm not sure I understand the question either. But if you want to apply 4.98V directly to Ec+ or Ec- it will cause problems. Ec is limited to less than one Vbe or the junctions in the gain cell will become reversed biased. Take a look at...
- Tue Oct 13, 2009 1:27 pm
- Forum: Pro Audio Design
- Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
- Replies: 80
- Views: 353257
Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
Very clever idea. Thanks for joining us and posting. I want to keep the complete amp DC coupled if possible, and in the 0dB setting the ofset is close to 0mV, but in the 9dB setting I get more that 200mV. But this is taken care of by a 15M Ohm resister to the negative voltage. This brings the ofset ...
- Mon Oct 12, 2009 1:05 pm
- Forum: Document
- Topic: SSL Phase Meter Schematic
- Replies: 16
- Views: 32137
Re: SSL Phase Meter Schematic
Since I was never a practicing engineer my use of the "phase meter" was for setting 2 track azimuth. I almost never used it for multi track azimuth preferring the mono sum method. I'm glad I don't have to deal with tape any more. :| I could see how the SSL type which indicates correlation ...
- Fri Oct 09, 2009 10:41 am
- Forum: The Peabody Lounge
- Topic: Check Out This 9V Battery
- Replies: 7
- Views: 12884
Re: Check Out This 9V Battery
The guy in the article was using clip leads and got hosed by it.
I guess those batteries were marked according to electron flow vs. conventional current flow.
I guess those batteries were marked according to electron flow vs. conventional current flow.
- Fri Oct 09, 2009 8:48 am
- Forum: The Peabody Lounge
- Topic: Check Out This 9V Battery
- Replies: 7
- Views: 12884
Check Out This 9V Battery
Now that I've set it up with a picture here's the rest of the story....
http://www.rwonline.com/blog/87860
- Thu Oct 08, 2009 4:35 pm
- Forum: Document
- Topic: SSL Phase Meter Schematic
- Replies: 16
- Views: 32137
Re: SSL Phase Meter Schematic
I think people would find it useful John.
- Sun Oct 04, 2009 3:47 pm
- Forum: Pro Audio Design
- Topic: THAT1646 Current Booster and Transformer Driver
- Replies: 45
- Views: 129200
Re: THAT1646 Current Booster and Transformer Driver
The nominal supply voltage is 27.5V, but it has to operate down to 17V. To minimize power dissipation (so it will work at higher temperatures), I am trying to keep the supply at 7 volts. OK. 7V rules out the 1646 since the minimum is 8V. If the elevated temperature requirement didn't prevent it you...
- Sun Oct 04, 2009 3:15 pm
- Forum: Pro Audio Design
- Topic: THAT1646 Current Booster and Transformer Driver
- Replies: 45
- Views: 129200
Re: THAT1646 Current Booster and Transformer Driver
Jeff - I drove a 150 Ohm Edcor primary with no problems using the 1646. The output produced up to +24 dBm.
Is this 28V single-supply?
Is this 28V single-supply?
- Sun Oct 04, 2009 12:52 pm
- Forum: Pro Audio Design
- Topic: THAT1646 Current Booster and Transformer Driver
- Replies: 45
- Views: 129200
Re: THAT1646 Current Booster and Transformer Driver
Hi Jeff - Thanks for joining us! https://www.ka-electronics.com/images/jpg/THAT1646_Current_Boost.JPG The 1646 in the current-boosted application shown above using "common mode drive" (sense inputs driven - both outputs tied together) does not have OutSmarts enabled. The outputs do not hav...