trans4funks1
Well-known member
- Joined
- Feb 4, 2013
- Messages
- 328
Hi,
I have been looking at the schematic for the Matador/Chunger C12 clone as an inspiration for a DIY project I have been working on:
http://musicalsparks.com/images/c12/c12_schematics_v3.pdf
and I am wondering what the reasoning is behind the choice of a 4700uF value for C6, C7, and C8 in the heater supply.
I am not trying to be difficult. I don't have very much experience with regulated supplies so this is a sincere question. The C12 clone design seems like a hybrid of old fashioned unregulated layouts using lots of RC filtering with a regulator circuit placed right in the middle.
I have been looking at the data sheet for Fairchild's LM317 and it seems as if a 0.1uF filter cap is sufficient.
I am looking at the price difference between 4700uF caps and other choices, 1000uF for example, the 1000 is half the price of the 4700 and both seem like serious over kill.
I am also attracted to the idea of using smaller components such as are available for a 1000uF spec.
Finally I am wondering why there are 3 filter stages in front of the LM317 when it doesn't seem to matter.
Please, correct me if I am wrong, is there a benefit to including all the extra stages of high value RC filtering?
Thank You for any help you can offer.
I have been looking at the schematic for the Matador/Chunger C12 clone as an inspiration for a DIY project I have been working on:
http://musicalsparks.com/images/c12/c12_schematics_v3.pdf
and I am wondering what the reasoning is behind the choice of a 4700uF value for C6, C7, and C8 in the heater supply.
I am not trying to be difficult. I don't have very much experience with regulated supplies so this is a sincere question. The C12 clone design seems like a hybrid of old fashioned unregulated layouts using lots of RC filtering with a regulator circuit placed right in the middle.
I have been looking at the data sheet for Fairchild's LM317 and it seems as if a 0.1uF filter cap is sufficient.
I am looking at the price difference between 4700uF caps and other choices, 1000uF for example, the 1000 is half the price of the 4700 and both seem like serious over kill.
I am also attracted to the idea of using smaller components such as are available for a 1000uF spec.
Finally I am wondering why there are 3 filter stages in front of the LM317 when it doesn't seem to matter.
Please, correct me if I am wrong, is there a benefit to including all the extra stages of high value RC filtering?
Thank You for any help you can offer.