Hello,
I plan on building a supply which will power a bridged/paraelle LM3886T similiar to the one in the application note (National's AN-1192) which calls for a +/- 42V. Howevevr, I also want to power 4 individual GainClones using LM3875 or LM1875 chips. Now of course +/- 42V is too much for a GainClone. So I guess what I'm asking is whats considered the uppermost supply voltage that can be used in a GainClone?
Pete
I plan on building a supply which will power a bridged/paraelle LM3886T similiar to the one in the application note (National's AN-1192) which calls for a +/- 42V. Howevevr, I also want to power 4 individual GainClones using LM3875 or LM1875 chips. Now of course +/- 42V is too much for a GainClone. So I guess what I'm asking is whats considered the uppermost supply voltage that can be used in a GainClone?
Pete
Peter,
For the LM-1875 this is even lower than for the LM3875. The LM1875 has an absolute maximum (datasheet) of +/- 30 Volts DC. But I used a power transformer of -16.5 and +16.5 Volts AC which results in +/- 23 Volts DC after rectification.
The LM3875 has an absolute maximum rating of 84 Vdc rail-to-rail (+/- 42 Vdc), but most on this formum use lower values in order to connect speakers with lower impedance to their gainclone. I used a dual 22 Vac transformer of Plitron/Amplimo which provides +/- 31.1 Vdc after rectification.
Therefore, I do not think it is a good idea to share transformers for these different chips unless you want to put the bridgeclone on a lower supply voltage intentionally.
(project and Power Supply background on http://gainclone.platenspeler.com)
Maarten
For the LM-1875 this is even lower than for the LM3875. The LM1875 has an absolute maximum (datasheet) of +/- 30 Volts DC. But I used a power transformer of -16.5 and +16.5 Volts AC which results in +/- 23 Volts DC after rectification.
The LM3875 has an absolute maximum rating of 84 Vdc rail-to-rail (+/- 42 Vdc), but most on this formum use lower values in order to connect speakers with lower impedance to their gainclone. I used a dual 22 Vac transformer of Plitron/Amplimo which provides +/- 31.1 Vdc after rectification.
Therefore, I do not think it is a good idea to share transformers for these different chips unless you want to put the bridgeclone on a lower supply voltage intentionally.
(project and Power Supply background on http://gainclone.platenspeler.com)
Maarten
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