Search found 304 matches
- Sun Jan 31, 2021 6:20 pm
- Forum: The Peabody Lounge
- Topic: beverly hillbilly storm windows and cybernetic heat control
- Replies: 37
- Views: 110177
Re: beverly hillbilly storm windows and cybernetic heat control
I have some spare GFCI outlets in my stash, so the outlet by my bed now looks like a good candidate for GFCI. JR I searched to know what a GFCI is. I found a lengthy description that keeps repeating it protects from faults but nothing really clear ( or I was not patient enough ). In France we have ...
- Thu Jan 28, 2021 3:38 am
- Forum: Test, Measurement and Repair
- Topic: how to test relays for phono signals
- Replies: 15
- Views: 85927
Re: how to test relays for phono signals
The datasheet is clear.crin wrote: ↑ is there a particular reason why you suggest the 1510 instead of the 1512?
Here high gain is needed.
- Sat Jan 23, 2021 1:47 pm
- Forum: The Peabody Lounge
- Topic: digital thermometers.... arghhh
- Replies: 21
- Views: 48618
- Fri Jan 22, 2021 3:36 pm
- Forum: Pro Audio Design
- Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
- Replies: 165
- Views: 383154
Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited
For the balanced only version, I would manage going from 4 caps to only one, by means of footprints to allow the cap to jump over the J1 node.
- Fri Jan 22, 2021 1:50 pm
- Forum: Pro Audio Design
- Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
- Replies: 165
- Views: 383154
Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited
I do not understand about J1 J2.
I see a balanced-only configuration as a underpopulated board, no J1 no J2 no VR2 but a strap, four caps become one.
I see a balanced-only configuration as a underpopulated board, no J1 no J2 no VR2 but a strap, four caps become one.
- Thu Jan 21, 2021 8:20 pm
- Forum: Pro Audio Design
- Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
- Replies: 165
- Views: 383154
Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Yes. A link given by mediatechnology in a previous post. http://www.janascard.cz/PDF/An%20ultra%20low%20distortion%20oscillator%20with%20THD%20below%20-140%20dB.pdf Very informative, a key source. With: Resistors are preferably 0.1%, 15 ppm/K through-hole types, capacitors are preferably polystyrene...
- Wed Jan 20, 2021 4:47 pm
- Forum: Pro Audio Design
- Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
- Replies: 165
- Views: 383154
Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited
I was amazed to see very good notch depth despite a +/- 10% capacitor. Thanks to the two trimmers adjusted in SE mode to accurately get Fc 1KHz, I get -96dB notch depth on the 6 cases I simulated. The trimmed 15.9k range is: 14.5k to 17.7k. The trimmed 15.9k/2 range is: 7.4k to 8.6k. So, I think you...
- Wed Jan 20, 2021 1:46 pm
- Forum: Pro Audio Design
- Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
- Replies: 165
- Views: 383154
Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited
I have done more work about the two ways to build a balanced notch filter. This is about J1 and J2. What is best two jumpers or one jumper. I had thought a twin H was better rather than a double Twin T. It looks good and can be built with all equal capacitors. Then I realized that this was not a rat...
- Tue Jan 19, 2021 4:57 am
- Forum: The Peabody Lounge
- Topic: digital thermometers.... arghhh
- Replies: 21
- Views: 48618
Re: digital thermometers.... arghhh
Definitely. This is the real thing and it would look great in JR backyard.mediatechnology wrote: ↑Tue Jan 19, 2021 4:43 am You need a "cotton region" shelter for your outdoor instruments...
https://proaudiodesignforum.com/forum/p ... f=12&t=476
- Thu Jan 14, 2021 4:33 pm
- Forum: Pro Audio Design
- Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
- Replies: 165
- Views: 383154
Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited
So far, with simulations I found no difference. Virtual grounds connected or not, no difference detected. The unbalances, I tried: inputs amplitudes 0.25 0.75 ( iso 0.5 0.5 ) input resistance 1K 2K ( iso 1K 1K ) With or without differential output load 100K. Interesting. I found the same thing on t...