ebartlet
Well-known member
I'm replacing the 4558's with 5532's, 70 of them! I would like to avoid building a new PS, to save $. According to the spec sheet, 4558's draw 6.6ma max and 5532's draw 16ma max.
Max current draw stock on the +16.5/-16.5 supply is estimated to be about 0.5A After replacing the IC's, I'm estimating a current draw of 1.4A
I beleive that the transformer and most of the regulator circuit might be up to the task.
Here is the schematic:
http://www.ericbartlett.com/images/tapco_c12_power_supply.JPG
I do not have any other trannies to compare with, but here's what I know:
Height=2 3/4" width=2 3/4" length=3 1/4" stack height=1 1/4"
The 30 - 0 - 30 windings measure 26 - 0 - 26 and 1.35/1.35 ohms.
Can anyone give me an estimate on the VA rating? I tried to calculate but I don't think I came up with an accuarate number (not even close!?!)
The other two windings are for phantom power and meter lights (4).
Here is what I think I should replace:
-1N4002 diodes in bridge with something bigger
-R9-12, R27-30 Need higher power dissapation
-Upgrade filter caps
The TIP41 (Q4) and TIP42 (Q10) pass transistors are good for 6A max.
Any thoughts, hints or suggestions?
Thanks
Max current draw stock on the +16.5/-16.5 supply is estimated to be about 0.5A After replacing the IC's, I'm estimating a current draw of 1.4A
I beleive that the transformer and most of the regulator circuit might be up to the task.
Here is the schematic:
http://www.ericbartlett.com/images/tapco_c12_power_supply.JPG
I do not have any other trannies to compare with, but here's what I know:
Height=2 3/4" width=2 3/4" length=3 1/4" stack height=1 1/4"
The 30 - 0 - 30 windings measure 26 - 0 - 26 and 1.35/1.35 ohms.
Can anyone give me an estimate on the VA rating? I tried to calculate but I don't think I came up with an accuarate number (not even close!?!)
The other two windings are for phantom power and meter lights (4).
Here is what I think I should replace:
-1N4002 diodes in bridge with something bigger
-R9-12, R27-30 Need higher power dissapation
-Upgrade filter caps
The TIP41 (Q4) and TIP42 (Q10) pass transistors are good for 6A max.
Any thoughts, hints or suggestions?
Thanks