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Power Supply Upgrade - Request Sanity Check

Posted by tetsuo (A) on November 21, 2013 at 10:55:08

Hi! I post very infrequently, although I've been a reader here for a few years and learned from more experienced designers. My audio interest is evolving from buying commercial gear to upgrading and designing gear for my specific and personal applications. I believe I have a logical mindset, but my EE circuit design knowledge is dated and rusty.

I'm requesting feedback on my project:

I have a Dahlquist DQ LP-1 low pass crossover filter, used to integrate my sub bass (a pair of Danley Sound Labs tapped horns) with mains (multi-way front horn-loaded speakers of my design). Here is a schematic:



I want to upgrade the power supply to accomplish:

1) Potentially better sound - better dynamics / headroom and stronger / deeper LF bass

2) Have the option to roll opamps - the power transformer is current limited at 35mA, sufficient for the MC4558 ICs, but under spec'd for newer substitutes that draw more power.

Stock - 5 x IC 4558 draw 5mA ea, total 25mA

Proposed upgrade - 5 x OP2604 draw 10.5mA ea, total 52.5mA

The stock PS outputs + / - 15V


My proposal has three parts:

1) Replace Diodes CR1 - CR5 (1N4004) with Cree Schottky 1A 600V diodes, simply for best practices


2) Upgrade power transformer capacity:

Stock power transformer - Signal Transformer DPC-34-35

Size: 1.2VA

Primary: 115V / 230V

Secondary: 34VCT @ 35mA

Proposed upgraded transformer - Signal Transformer or Hammond

Size: 4.4VA

Primary: 115V / 230V

Secondary: 34VCT @ 125mA


3) Increase PS energy storage capacity

C18 and C19 are 220uf 35V

C15, C16, C17 are 47uf 25V

Propose increasing the capacity and voltage ratings of these electrolytic caps, roughly double the stock specs.

Question - Please poke holes in my project. I learn from constructive input.

Much thanks!

This post is made possible by the generous support of people like you and our sponsors:

Kimber Kable

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