Signetics was an American electronics manufacturer specifically established to make integrated circuits.[1] Founded in 1961, they went on to develop a number of early microprocessors and support chips, as well as the widely used 555 timer chip. They were bought by Philips in 1975 and incorporated in Philips Semiconductors (now NXP).[1]
Okay, crazy as i am.
I just ordered 4x DIY 28B SST2 with parts and 4 power board 😱
This i wanna build to run my Infinity IRS Beta when my dedicated room is finish build.
So this will be a long time project to get all 4 blocks finished.
But all tips from you will help alot.
All from with Toroidal Transformer, to transistor type and matching.
Also, if anyone find the 28B clone cabinet ill be lucky man 😀
I just ordered 4x DIY 28B SST2 with parts and 4 power board 😱
This i wanna build to run my Infinity IRS Beta when my dedicated room is finish build.
So this will be a long time project to get all 4 blocks finished.
But all tips from you will help alot.
All from with Toroidal Transformer, to transistor type and matching.
Also, if anyone find the 28B clone cabinet ill be lucky man 😀
DOA33
Sensation45 - I am not sure what you mean with that question. Sorry,
The DOA is strictly a preamp while the 4B is a power amp.
Or do you mean taking 33V from the 4b?
Or do you want to run 4B on 33V like the DOA33?
Sensation45 - I am not sure what you mean with that question. Sorry,
The DOA is strictly a preamp while the 4B is a power amp.
Or do you mean taking 33V from the 4b?
Or do you want to run 4B on 33V like the DOA33?
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DOA33
Why is that? Seems like I need to finish this board to verify for myself... 🙂
Why is that? Seems like I need to finish this board to verify for myself... 🙂
DOA33
Sorry, my mistake. Q6 says 2N5210 (which is correct) but it is shown as a PNP transistor. Thank you for pointing it out!
Here is the corrected schematic.
Sorry, my mistake. Q6 says 2N5210 (which is correct) but it is shown as a PNP transistor. Thank you for pointing it out!
Here is the corrected schematic.
Attachments
DOA33
Afraid I am not an expert on 4B-SST, but I guess it has enough current in the +/- 33V lines to handle this card.
Maybe someone can explain this more adequately. 😉
Afraid I am not an expert on 4B-SST, but I guess it has enough current in the +/- 33V lines to handle this card.
Maybe someone can explain this more adequately. 😉
I don't think replacing the zener will change anything. The zener is just a voltage reference and the darlington transistor configuration draws a very small amount of base current.
The MJE15034 is responsible for delivering enough current, and must have a sufficient heatsink.
I think this regulator has enough current capabilities to supply an additional DOA33.
Try it, and just feel the MJE15034 not heating too much. I don't think it will.