I'm making a device that requires thermal coupling of transistors. I can couple devices mechanically in several ways. I'd like to test and find out which of the coupling method works best.
Is there any recommended procedure or, maybe, paper that describes how to measure such a thing?
Search found 88 matches
- Sat Jun 20, 2020 6:13 pm
- Forum: Pro Audio Design
- Topic: Method for testing thermal coupling
- Replies: 9
- Views: 29292
- Mon Sep 03, 2018 5:36 pm
- Forum: Pro Audio Design
- Topic: Negative impedance converter reactance
- Replies: 10
- Views: 11451
- Mon Sep 03, 2018 2:49 pm
- Forum: Pro Audio Design
- Topic: Negative impedance converter reactance
- Replies: 10
- Views: 11451
Re: Negative impedance converter reactance
I'm not ready for production quantities...
This resistor sets the frequency in the bridged-t equalizer.
This resistor sets the frequency in the bridged-t equalizer.
- Mon Sep 03, 2018 12:35 pm
- Forum: Pro Audio Design
- Topic: Negative impedance converter reactance
- Replies: 10
- Views: 11451
Re: Negative impedance converter reactance
Well, the whole point of this exercise is to get rid of an awkward dual rev log 100k pot and replace it with somewhat more friendly dual 10k linear one.
- Mon Sep 03, 2018 10:41 am
- Forum: Pro Audio Design
- Topic: Negative impedance converter reactance
- Replies: 10
- Views: 11451
Re: Negative impedance converter reactance
NR1 and NR2 nodes are where the circuit from the first post (NIC) connects. There are two identical NICs, one with NR1 terminals, another with NR2 terminals.So they connect in parallel to R33 and R34 and are there to mimick the -11K resistance.
- Mon Sep 03, 2018 1:55 am
- Forum: Pro Audio Design
- Topic: Negative impedance converter reactance
- Replies: 10
- Views: 11451
Re: Negative impedance converter reactance
Sorry, got distracted by kids and forgot to upload the other part. The first snippet goes in parallel with each potentiometer.
- Sun Sep 02, 2018 4:02 pm
- Forum: Pro Audio Design
- Topic: Negative impedance converter reactance
- Replies: 10
- Views: 11451
Negative impedance converter reactance
I'm trying to achieve a specific resistance curve and to do that I need to connect a negative resistor in parallel to the variable resistor in the circuit. I'm testing the standard NIC circuit (see attachement) which works mostly as expected. But at some settings of the variable resistor it looks li...
- Sun Jun 24, 2018 4:40 pm
- Forum: Pro Audio Design
- Topic: THAT 202XL recreation
- Replies: 26
- Views: 30413
Re: THAT 202XL recreation
Hmmmm.... That's interesting. So what are the possible ways of trimming the feedthrough then? Applying step impulses and monitoring the output? EDIT: just saw your last post with the quote from Gary. That's what I heard somewhere as well. So this leaves the first question that I asked: I get the low...
- Sun Jun 24, 2018 3:41 pm
- Forum: Pro Audio Design
- Topic: THAT 202XL recreation
- Replies: 26
- Views: 30413
Re: THAT 202XL recreation
My apologies for not being precise and for possible confusion. Of course there should be an external trim circuit for minimizing THD. As you said, this is often a voltage divider connected between +/- rails and fed into the sym pin of the VCA. I have this arrangement, I just didn't mention this fact...
- Sun Jun 24, 2018 2:52 pm
- Forum: Pro Audio Design
- Topic: THAT 202XL recreation
- Replies: 26
- Views: 30413
Re: THAT 202XL recreation
A quick update. The 2002T curcuit is working fine with diluted tempco as suggested by montemcguir. Thanks for sharing the idea. I'm having a hard time with "VA ADJUST" trimmer though. As is shown on the schematic , the total resistance can be varied between 10k and 60k. As far as I know, t...