Please Help Toroid Question for F1

milezone · 21st August 2009, 05:03 PM

Hello,

So I'm building a First Watt F1 and recently purchased this transformer: http://search.digikey.com/scripts/Dk...ame=TE60602-ND

I thought it fit the specifications however after some inspection I noticed that it seems to be missing a couple leads. The one I ordered has six leads however transformers in photographs of the amp appear to have around 8 or 9 leads. I'm concerned that I need to return the unit. Is what I'm describing a problem? Can it be alleviated with some modification? Please help!

Redshift187 · 21st August 2009, 05:25 PM

Is it the 60602? It looks like it should have single primary designed for 117V (will work with 110V and 115V), and dual 18V secondaries. That would be 6 wires. The photos are not always exactly what you're ordering.

milezone · 06:18 PM

It is the 60602. I received it and it is six wires. My sense tells me that there should be more wires however (i.e. dual primary dual dual secondary). I assumed the F1 would use a single primary transformer but now I'm not sure upon looking at photos.

Redshift187 · 22nd August 2009, 06:10 PM

The number of primaries is irrelevant to the amp. If you are in the U.S. as your location flag tells me, the transformer will work. Dual primaries just makes a transformer work for most countries, 110V or 220V, as long as it was designed for both 50Hz and 60Hz.

milezone · 22nd August 2009, 06:19 PM

I am in the US. Thanks for the assurance. I assume that means that I can leave the 240v input holes on the power filter pcb blank. Right...? Also shouldn't there be a ground lead as well?

Redshift187 · 23rd August 2009, 09:45 PM

Someone else should chime in, but looking at the service manual from the First Watt website, I would say connect the transformer to the spots marked 120A and 0A, then the thermistor between 0A and 0B. That would give you one thermistor in series with the transformer, the way it should be for a single 120V primary.

There is no ground on a dual secondary transformer, that's only on center-tap transformers. You may want to do a lot more reading about transformers and amp power supplies before attempting to build this. You don't want to make a mistake with the power supply.

milezone · 27th August 2009, 09:40 PM

Thank you for the help. I've done some research though I can't find much regarding the thermistor placement. I'm pretty sure the leads mount onto the power supply board however I've seen some more primitive uses (connecting them directly to the transformer wires. Any suggestions would be greatly appreciated.

21st August 2009, 05:03 PM	#1
milezone diyAudio Member Join Date: May 2009	Please Help Toroid Question for F1 Hello, So I'm building a First Watt F1 and recently purchased this transformer: http://search.digikey.com/scripts/Dk...ame=TE60602-ND I thought it fit the specifications however after some inspection I noticed that it seems to be missing a couple leads. The one I ordered has six leads however transformers in photographs of the amp appear to have around 8 or 9 leads. I'm concerned that I need to return the unit. Is what I'm describing a problem? Can it be alleviated with some modification? Please help!

21st August 2009, 06:14 PM	#3
milezone diyAudio Member Join Date: May 2009	It is the 60602. I received it and it is six wires. My sense tells me that there should be more wires however (i.e. dual primary dual dual secondary). I assumed the F1 would use a single primary transformer but now I'm not sure upon looking at photos. Last edited by milezone; 21st August 2009 at 06:18 PM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Toroid PT question	audiowize	Tubes / Valves	10	5th January 2009 08:02 PM
toroid question	slr 5000	Power Supplies	21	19th June 2008 09:58 PM
Toroid question	amisdad	Chip Amps	6	25th September 2004 07:59 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

21st August 2009, 05:25 PM	#2
Redshift187 diyAudio Member Join Date: Aug 2008	Is it the 60602? It looks like it should have single primary designed for 117V (will work with 110V and 115V), and dual 18V secondaries. That would be 6 wires. The photos are not always exactly what you're ordering.

22nd August 2009, 06:10 PM	#4
Redshift187 diyAudio Member Join Date: Aug 2008	The number of primaries is irrelevant to the amp. If you are in the U.S. as your location flag tells me, the transformer will work. Dual primaries just makes a transformer work for most countries, 110V or 220V, as long as it was designed for both 50Hz and 60Hz.

22nd August 2009, 06:19 PM	#5
milezone diyAudio Member Join Date: May 2009	I am in the US. Thanks for the assurance. I assume that means that I can leave the 240v input holes on the power filter pcb blank. Right...? Also shouldn't there be a ground lead as well?

23rd August 2009, 09:45 PM	#6
Redshift187 diyAudio Member Join Date: Aug 2008	Someone else should chime in, but looking at the service manual from the First Watt website, I would say connect the transformer to the spots marked 120A and 0A, then the thermistor between 0A and 0B. That would give you one thermistor in series with the transformer, the way it should be for a single 120V primary. There is no ground on a dual secondary transformer, that's only on center-tap transformers. You may want to do a lot more reading about transformers and amp power supplies before attempting to build this. You don't want to make a mistake with the power supply.

27th August 2009, 09:40 PM	#7
milezone diyAudio Member Join Date: May 2009	Thank you for the help. I've done some research though I can't find much regarding the thermistor placement. I'm pretty sure the leads mount onto the power supply board however I've seen some more primitive uses (connecting them directly to the transformer wires. Any suggestions would be greatly appreciated.