Group Buy: SST03 Soft start for toroidal transformers

[peranders]

I have put up a wiki page for my SST03 soft start group buy.
Group buy: SST03 softstart - diyAudio
Picture

 

[regiregi22]

What are the differences regarding SST02?

Thanks,

 

[peranders]

I have made adjustments for 110 VAC. C1 and C2 (the black caps) are changed to 680 nF.

 

[SRMcGee]

PA:

Are there any practical limits on the SST03 in terms of the wattage of the transformer? In other words, are its traces able to handle a 1000 VA toroid?

Regards,
Scott

 

[peranders]

Yes, 1000 VA is OK.

 

[peranders]

I'm closing this offer in the beginning of April so hurry up.

 

[DaveM]

With the low quantities on the GB, is this still a go? I just found it and am definately in for 2 boards and connectors.

 

[peranders]

I haven't decided yet. 12 pcb's aren't much.

 

[DaveM]

Have you posted the existence of this GB over on the Pass Labs page? There might be some more demand from there. That is what I could use them for. 750VA 18V primary transformers for F4s right now, but Aleph AX in the future and then who knows what. I am building seperate power supplies that I can use for any of Neslon's ~22 V rail designs.

 

[peranders]

I avoid cross posting, no I haven't.

 

[fredlock]

Hi Peranders,

On your website, it says;

" Other mains voltages
The pcb is not tested yet for 110-120 VAC but I'll expect that 2 x 0.68 uF (C1, C2) would be sufficient. The capacitor value is also dependent of the relays and their current consumption."

Did you get any feedback from USA DIY'ers, that ordered your soft start kit, if they encountered any problem using it on their amps?

 

[peranders]

I may change the text because it is tested and noone has come back in this matter.

 

[peranders]

I'll go ahead with this group buy. I think there is enough in preorder. Please check over your orders and I'll send you a Paypal invoice.

 

[peranders]

I have sent a message to you all (except for Murdoc) about checking your orders and also come back to me when you have done so.

 

[peranders]

Have you posted the existence of this GB over on the Pass Labs page? There might be some more demand from there...

No. Didn't think about that but feel free to mention this.

 

[ua100k]

Alternative

Hi guys,

Before you go ahead with your design and purchase. Take a look at this. It is pre-built and I think cheaper. I am not sure if it is complete but it looks like it and much cheaper - at least in the US.

Amperite - 120A1-100MST1A - Time Delay Relays (TDR) - Sensors, Switches & Relays - Allied Electronics

Amperite - Solving your relay requirements since 1922

These are relays with a delayed turn on accepting up to 240 v to turn it on. The standard product is 2 Amps and up to 10 Amps are available from the factory.

Timing is from 0.1 sec to 10 secs.

Would be interested if anyone has tried this.

 

[peranders]

Notice that this product is for DC, not AC.

 

[ua100k]

Yes, This particular model it.
If you look at the manufacturers web site, they will show you how to order to your specs - ac/dc, voltage, Current, time - variable or fixed, etc.

I will try one and let you know.

 

[peranders]

I would appreciate if you start a separate thread about your findings. Notice that my solutions has additional features like a mains switch and also terminals. If you use a time relay you must also have the resistor and some additional terminals and maybe also a relay socket. In my subwoofer I used an Elesta relay with a very small delay unit inserted in the relay socket.

Very good stuff, not cheap either.
http://www.elesta.ch/download/pdf/skr_e.pdf
Last page, STM100 module + SKR115 relay + ZKE118 socket + resistor

 

[ua100k]

Thanks for the relay tip. I will start a new thread. Sorry for the intrusion.