Randy Slone Zus Audio Totem-Pole Build needs 12V trigger - diyAudio
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Old 6th March 2012, 08:15 PM   #1
tjencks is offline tjencks  United States
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Default Randy Slone Zus Audio Totem-Pole Build needs 12V trigger

Hello fellow DIYers,

I have just completed many years and a lot of effort / mistakes my first DIY build that actually works. I purchased 5 kits of Totem-Pole amps from David at Lede audio and have gotten 3 working so far.

This was my first DIY amp project and has been a tremendous learning experience. I will post pics if folks are interested.

Anyway I am now in search of a circuit to implement a 12V trigger within each amp so that when I switch on my Preamp / Processor each of my totem-pole amps will switch on after some elected delay.

Does anyone have a circuit they could share which would accomplish this functionality?
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Old 7th March 2012, 09:47 AM   #2
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Pics are always welcomed .
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Old 7th March 2012, 08:56 PM   #3
tjencks is offline tjencks  United States
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Default Pic of Totem-Pole Amps

Hey All,

So for those of you who'd like to get a look at my build here is an example. I did 5 of these unfortunately only two are working at the moment which I will get into on another post.

https://picasaweb.google.com/1173122...eat=directlink

So for the curious the parts I used for the power supply are as follows:

1. Custom PCB which I had made in 4 oz copper from Epec Tech. BTW I've got a large back stock of these if others are interested.

2. Toroid is a Toroid Tech custom 500VA with 138VAC primary and 56VAC Secondary's which work out to around 49VAC at 120VAC in. So after rectification it works out to about 67V rails.

3. Caps are Panasonic 6800uF T-HA types. Snubbers are WIMA .1uF pulse caps. The square looking caps on the end there are Mundorf RXF in Oil 5.6uF.

4. Inductors are 14AWG copper foil 2.2mH Erse.

5. Dual Bridge rectification is handled by two IXYS FBS 10-06 SC.

6. Wiring is a mix of Cardas chassis wire, Vampire Copper cast and just plane old stuff from home depot for grounding.

7. RCA jack is Vampire as well as the binding posts. The pure copper types.


This is my first project so I'm sure there may be a lot to criticize here so please be kind folks as I'm a noob. I have learned quite a bit but I realize how much more knowledge is required to be really effective at this hobby.

-TJ
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Old 7th March 2012, 09:03 PM   #4
tjencks is offline tjencks  United States
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Default Amp failure

Alright so I mentioned that I've got 5 of these amps and only two are working currently. Another two are on hold cause one amp module has a defective part some place and doesn't measure right or pass the build checks that Ledeaudio provides for having a working amp.

However that leaves just one that was working until last night. All of a sudden the gain dropped to almost nothing and the sound is super scratchy and messed up. I have a feeling that one of my L-MOS devices died. These are the 2JS162 and 2KS1058 types.

If anyone can provide feedback on what a good strategy would be to track down and replace a defective MOSFET that would be most helpful. Would it be as simple as taking a working unit and compare voltages on each leg of each device?

Many of you may want a schematic and unfortunately I don't believe I can post one here as the amp design is copy write to Zus audio unless Russ says its alright. But is someone is willing to help me out I believe I can share the info directly via PM.

Best Regards,
TJ
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Old 9th March 2012, 08:37 AM   #5
tjencks is offline tjencks  United States
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Default Sat down to listen

Just sat down for a bit to really listen to the amps and I am indeed very impressed certainly the best pair of amps I've ever owned and some of the finest I've heard the Slone Totem-Pole amps are forreelz folks.

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Old 9th March 2012, 11:49 AM   #6
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Is Rus the owner of the designs ??? Ive diyed a set of these amps many years ago, schematics are as far as I know are all over the net, thats where I found them.
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Old 9th March 2012, 06:20 PM   #7
tjencks is offline tjencks  United States
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I have seen the Opti-MOS schematic available on the web but not the Totem-Pole. If Rus says its alright I will post up the Totem-Pole schematic. But yes I believe that both the opti and totem-pole are copyright to Zus Audio. Just don't want to step on any toes.

-TJ
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Old 12th March 2012, 01:38 PM   #8
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If anyone can provide feedback on what a good strategy would be to track down and replace a defective MOSFET that would be most helpful. Would it be as simple as taking a working unit and compare voltages on each leg of each device?


TJ[/QUOTE]


Checking the voltage drop across all output resistors (as in quiescent current setting ) and comparing with the good one would be a good place to start . Plus comparing the DC offset voltage .
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Old 13th March 2012, 06:18 AM   #9
tjencks is offline tjencks  United States
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Thanks Epicyclic,

I will give it a shot. Were you able to see a picture of the build?
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Old 13th March 2012, 10:02 AM   #10
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Yeah....... cool

Can i see DC offset protection circuits in the photos ?
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