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Old 30th September 2012, 10:19 AM   #511
brianco is offline brianco  Ireland
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Location: Scottish Borders - Kelso; on the famous Tweed River!
Where do I find the English Language version of the handbook? [My boards were bought earlier]

Many thanks,

B
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Old 30th September 2012, 10:29 AM   #512
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@Brianco: give me your EMail - address, please, and you will have it.

Best regards - Rudi_Ratlos
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Old 30th September 2012, 09:50 PM   #513
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Carl: any update from your side as well?

Best regards - Rudi_Ratlos
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Old 1st October 2012, 08:08 AM   #514
brianco is offline brianco  Ireland
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RUDI,

Instructions received; many thanks.

Brian
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Old 1st October 2012, 11:55 AM   #515
cjkpkg is online now cjkpkg  United States
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Made some good progress this weekend. Somehow the 22k resistors did not make it into my shopping cart at Mouser...ARGH!
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Old 1st October 2012, 12:29 PM   #516
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Carl, please check the polarity of C4 / 470F / 16V.

I will have a closer look at it later on.

The MICA capacitors that your ordered, are very good!

I ordered the wrong ones, ,with a much too wide grid and too thick legs, and I spoiled the nail-file of my spouse. O dear!

Best regards - Rudi_Ratlos

Carl: you do not have to do a new DIGIKEY-order for the 22K resistors!
They are just to delimit the current flowing through the LEDs!
Take a 10K, 6K8, 4K7, ..., use Ohm's law: 35V rail-voltage - 2V forward drop across the LED - divided by some mA - giving the value of the resistor.

Last edited by Rudi_Ratlos; 1st October 2012 at 12:48 PM.
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Old 1st October 2012, 11:59 PM   #517
cjkpkg is online now cjkpkg  United States
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Not just the led resistors but all of the 22k resistors...I think there are 5 per board. I might be able to pick some up at radio shack.

The cap is good as far as orientation.

Last edited by cjkpkg; 2nd October 2012 at 12:04 AM.
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Old 2nd October 2012, 03:40 PM   #518
evette is offline evette  Canada
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MR.Rudi recieved my boards yesterday lovely,,,Thanks great job. Evette
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Old 3rd October 2012, 12:56 AM   #519
RKH is offline RKH  United States
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Quote:
Originally Posted by Rudi_Ratlos View Post
Ryan,
a transformer with 2 x 28VAC secondaries will give you about +/- 39VDC (roughly) after rectification.
Please take in account deviations in mains voltage, ..., as well.

This voltage may be critical for "sensitve" input transistors, like the 2SK170.

I therefore recommend you to solder the cap-multiplier and use a Z036 Zener-diode so that the frontend's voltage will be delimited to 35.3V (roughly).

Best regards - Rudi
Rudi,
Do I understand you correctly: I only need to replace the 33V zener with a 36V zener in the cap multiplier for safe operation at 39V rails?

Thanks,
Ryan
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Old 3rd October 2012, 07:37 AM   #520
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Ryan, I advise you to buy 2 pairs of 36V and 39V - Zener Diodes and measure them before use.
Zener diodes usually have an allowance (tolerance) of 10%!

If you want to use your 2 x 28VAC transformer and want your input transistors (f.e. 2SK170) being protected from damage
due to over-voltage (Vgds = 40V !), then use a 39V Zener (resp. 36V).
This will delimit the frontend-voltages to 38.4V (35.4V respectively).

The one, who has the best knowledge, how to operate a SYMASYM from higher voltages than 25VAC, is EVETTE.

As far as I remember, EVETTE operates one of his SYMASYMs from +/-50 VDC.

Joseph: is there anything you changed (exept rail-capacitors) to operate the SYMASYM from such high voltages?
Which type of input transistors did you use?

Best regards - Rudi_Ratlos
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