Author |
Message |
cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
|
|
Back to top
|
|
|
gabbagabi
Joined: Nov 29, 2008 Posts: 651 Location: Berlin by n8
Audio files: 23
|
Posted: Wed Nov 07, 2018 10:18 am Post subject:
|
|
|
nice,
when ur want to use this also for protecting cmos of negative voltages, may diodes on the output would protect even more?
or have two outputs per channel, one with and one without diode protection.
cu |
|
Back to top
|
|
|
cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
|
Posted: Wed Nov 07, 2018 11:31 am Post subject:
|
|
|
Good point. To protect vs. negative voltages, just thinking out loud: perhaps you could power the board from GND to V++ instead of V++ and V--? And maybe use Rail to rail quad op amps vs. say TL074?
Suggestions for negative protection are indeed needed--what does the group think is the best way? Link anyone?
This certainly comes up with getting signals into MPU like Arduino. You don't want high current V- for that. Zeners? 4148's? Something else?
I have seen a lot of circuit clamp fragments but don't know what works best.
Thanks. _________________ Visit my AUDIODIWHY blog and website |
|
Back to top
|
|
|
gabbagabi
Joined: Nov 29, 2008 Posts: 651 Location: Berlin by n8
Audio files: 23
|
|
Back to top
|
|
|
cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
|
Posted: Wed Nov 07, 2018 12:26 pm Post subject:
|
|
|
Thanks! Good suggestion.
Q: Do you take a diode drop doing that? 700mV or so? I thought so....
For many applications that won't matter, but sometimes it will. Assuming we do see that, I'd need the voltages pass through unencumbered. Same for signals coming into the buffer.
I am trying to figure this out, since I will be using 4066 and 4053 on an upcoming project and the voltages are driving some sensitive gear. _________________ Visit my AUDIODIWHY blog and website |
|
Back to top
|
|
|
gabbagabi
Joined: Nov 29, 2008 Posts: 651 Location: Berlin by n8
Audio files: 23
|
Posted: Thu Nov 08, 2018 11:12 am Post subject:
|
|
|
dunno but may the precisicion-rectifier could help you?
there u dont have to deal with the voltage drop.
as an example i did a simulation with 1Vpp input.
if so, than moving the offset to the first stage would make sense.
Description: |
|
Filesize: |
69.56 KB |
Viewed: |
325 Time(s) |
This image has been reduced to fit the page. Click on it to enlarge. |
|
Description: |
|
Filesize: |
49.35 KB |
Viewed: |
355 Time(s) |
This image has been reduced to fit the page. Click on it to enlarge. |
|
|
|
Back to top
|
|
|
cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
|
|
Back to top
|
|
|
MapacheRaper
Joined: Feb 15, 2018 Posts: 166 Location: Spain
|
Posted: Thu Nov 08, 2018 7:38 pm Post subject:
|
|
|
Hey Charlie, I have no idea on how to protect it, but I have recently discover your audiowhy blog and Im totally addicted to it... I just had to say it loud.
|
|
Back to top
|
|
|
gabbagabi
Joined: Nov 29, 2008 Posts: 651 Location: Berlin by n8
Audio files: 23
|
Posted: Thu Nov 08, 2018 10:20 pm Post subject:
|
|
|
i know almost nothing about zeners
the circuit is really called Precision_rectifier:
https://en.wikipedia.org/wiki/Precision_rectifier
it is also used as SAW2TRI converter, eg in the Yusynth VCO and LFO |
|
Back to top
|
|
|
cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
|
Posted: Fri Nov 09, 2018 8:56 am Post subject:
|
|
|
MapacheRaper wrote: | Hey Charlie, I have no idea on how to protect it, but I have recently discover your audiowhy blog and Im totally addicted to it... I just had to say it loud.
|
Thanks so much Mapache. I really enjoy writing it. _________________ Visit my AUDIODIWHY blog and website |
|
Back to top
|
|
|
cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
|
Posted: Fri Nov 09, 2018 9:00 am Post subject:
|
|
|
Ha! Thanks gabba, great link! I will try to breadboard it this weekend. _________________ Visit my AUDIODIWHY blog and website |
|
Back to top
|
|
|
cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
|
|
Back to top
|
|
|
gabbagabi
Joined: Nov 29, 2008 Posts: 651 Location: Berlin by n8
Audio files: 23
|
|
Back to top
|
|
|
|