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| Virtual ground circuit |
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| soldar:
--- Quote from: spec on January 12, 2019, 07:49:08 am --- I can't find any information about a discrete audio amplifier being used as a rail splitter in the thread that you link- have I missed something? --- End quote --- No. I only mention that the discrete component audio amplifier I posted there can very easily be modified to make a rail splitter because basically it already is a rail splitter. That's all. And it could handle up to 60 volts or more which is its working voltage. --- Quote from: spec on January 12, 2019, 07:49:08 am ---Besides which, are you really suggesting that you dedicate a whole discrete audio amplifier to generating a 0V rail- surely not. --- End quote --- I am not suggesting anything. I see all sorts of threads with people doing things I would never do but they have their reasons. People build with discrete components things you can get done by one IC. People are building circuits using tubes and old technology. People have fun doing whatever it suits them. I am just saying that audio amplifier is, basically, a rail splitter or voltage divider. Maybe that information or point of view is useful to somebody. Maybe someone would like to build a rail splitter with discrete components or just understand how they would work. |
| spec:
--- Quote from: soldar on January 12, 2019, 09:10:55 am --- --- Quote from: spec on January 12, 2019, 07:49:08 am --- I can't find any information about a discrete audio amplifier being used as a rail splitter in the thread that you link- have I missed something? --- End quote --- No. I only mention that the discrete component audio amplifier I posted there can very easily be modified to make a rail splitter because basically it already is a rail splitter. That's all. And it could handle up to 60 volts or more which is its working voltage. --- Quote from: spec on January 12, 2019, 07:49:08 am ---Besides which, are you really suggesting that you dedicate a whole discrete audio amplifier to generating a 0V rail- surely not. --- End quote --- I am not suggesting anything. I see all sorts of threads with people doing things I would never do but they have their reasons. People build with discrete components things you can get done by one IC. People are building circuits using tubes and old technology. People have fun doing whatever it suits them. I am just saying that audio amplifier is, basically, a rail splitter or voltage divider. Maybe that information or point of view is useful to somebody. Maybe someone would like to build a rail splitter with discrete components or just understand how they would work. --- End quote --- Thanks for reply soldar. I understand now. :) |
| aheid:
--- Quote from: spec on January 12, 2019, 12:28:07 am ---I am dying to know- what is this PSU for? :) --- End quote --- I was thinking of making a transistor curve tracer, just as a fun learning project. I was inspired by https://www.instructables.com/id/Transistor-Curve-Tracer/ but primarily wanted more symmetric handling of N and P channel transistors, as well as ideally higher current capability. As such I thought a split rail would make things much easier for me, and that got me searching for rail splitters. Now, gotten side-tracked by virtual ground circuits I didn't get much further thinking about the actual tracer. The main idea was to use a push-pull stage controlled by an opamp (referenced by a DAC) to provide a controlled collector current. Having thought a bit more about my goal I imagine I have two options that might be better than full-blown virtual split rails: - use push-pull MOSFETs and a charge pump to provide a negative supply for the controlling opamp - use push-pull BJTs, and another opamp to adjust for the offset created by Vce(sat) when trying to pull the collector low when testing P-channel transistors Anyway, thanks again for all the replies, they were very helpful and informative. |
| aheid:
I should add I was curious about the virtual ground circuit for possible use in future designs as well. |
| soldar:
--- Quote from: aheid on January 12, 2019, 05:42:03 pm --- I was thinking of making a transistor curve tracer --- End quote --- Yeah, that should not require much current so you could make a relatively simple rail splitter. OTOH I am not sure it is strictly necessary. |
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