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SECA Kit By Colin Wonfor
SECA Kit By Colin Wonfor
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Old 3rd June 2015, 07:49 PM   #1
Root2 is offline Root2  United Kingdom
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Default SECA Kit By Colin Wonfor

The new SECA KIT for the DIY is sounding very nice, PCB's for the Amp and the Dynamic PSU are now available.

I had Sam build them and he has now soldering or building experience.

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Old 5th June 2015, 02:51 AM   #2
anatech is offline anatech  Canada
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SECA Kit By Colin Wonfor
Hi Colin,
Are you offering these for sale? It appears that you might be.

We do have a commercial section on this site where you can "set up shop". We generally do not allow this activity in the general forums.

If you are all about the design rather than the sale, you can certainly start a thread where the design can be discussed and built by other members. In this case you must disclose the schematic, parts and any important details (like component matching for example). You must also post the PCB layouts. You are then welcome to sell PCBs and kits to our members who choose to go that route.

-Chris
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Old 5th June 2015, 10:23 AM   #3
Root2 is offline Root2  United Kingdom
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Thanks Chris I will post CCT and BOM today with luck here is that correct.???
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Old 7th June 2015, 08:50 AM   #4
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All the information is now being published on.

one4audio ? The S.E.C.A amps kits – the building process as experienced by a novice builder | HiFi Answers

This is part 2 I have to write up more ASAP has Howard needs to complete the article, so I need nagging with all the other things I am doing I have a system overload.

Also the bigger brother is being made by James on

Sovereign's New 40W SECA Class A - Audio Chews

This will be the first one made so I will be watching with interest.
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Old 7th June 2015, 02:05 PM   #5
Marra is offline Marra  United Kingdom
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SECA Kit By Colin Wonfor
So these are kits to buy?
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Old 7th June 2015, 10:45 PM   #6
anatech is offline anatech  Canada
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SECA Kit By Colin Wonfor
Hi Root2,
You would need to disclose the entire schematic and info in the thread. You are pretty much a vendor, so it's a gray area. As a vendor, you could make PCBs and parts kits available for sale but always allow those who can to build the entire thing from scratch. This is audio DIY after all.

If you have a number of products you should really be in a commercial area of the site. There is latitude here.

I'll go ask.

-Chris
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Old 8th June 2015, 07:13 AM   #7
Root2 is offline Root2  United Kingdom
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Click the image to open in full size.

Above is the bridge PSU for the basic SECA

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Above is the Basic SECA Amp.

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Above Silk screen of PCB for the basic SECA.

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Above 2oZ double sided PCB SECA Design.

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Above PCB SECA on test gig before remounting on larger heatsink.

Last edited by Root2; 8th June 2015 at 07:20 AM.
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Old 8th June 2015, 07:26 AM   #8
Root2 is offline Root2  United Kingdom
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Quote:
Originally Posted by Marra View Post
So these are kits to buy?
No but I do have PCB's to sell, but not complete kits.
Parts will depend on what Radio Shack and others have to match the required components. And since this is now available all over the world we all do not have Maplins etc.

Best Colin Wonfor
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Old 8th June 2015, 07:36 AM   #9
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I have also tried large FET's in place of the TIP142 but use a low RDsON type with a large gate capacitance , this will improve stability. As some FET went into self oscillation.
Also tried 55A 600V IGBT they also work but the loses across them was very high in the order of 2.5 - 3.2V where the TIP142 was 1.4V and the FET was below 100mV in full saturation.
The heatsink I used were 2 of AAVID THERMALLOY D180-20 HEAT SINK, T SLOTS, 0.33C/W one for each channel.

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Old 8th June 2015, 08:09 PM   #10
Root2 is offline Root2  United Kingdom
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Here is the BOM

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