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Old 18th February 2014, 09:36 AM   #1141
CeeVee is offline CeeVee  Portugal
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Hi Junie here are the full schematics and cabling diagram so it's up to you to choose the trafos and the relays you want to use.

Study the schematics and let me know if there are any remaining doubts.
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Last edited by CeeVee; 18th February 2014 at 09:39 AM.
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Old 18th February 2014, 09:44 AM   #1142
Junie is offline Junie  Philippines
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Now time to send my parts request to Farnell. Many thanks Carlos .
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Old 18th February 2014, 09:47 AM   #1143
CeeVee is offline CeeVee  Portugal
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I'm having trouble posting the Cabling file....I'll see what the problem is and send it later.
Anyway this complete schematic will answer all your component questions i think.

C
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Old 19th February 2014, 11:12 AM   #1144
Stealth is offline Stealth  Slovakia
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Quote:
Originally Posted by CeeVee View Post
I'm having trouble posting the Cabling file....I'll see what the problem is and send it later.
Anyway this complete schematic will answer all your component questions i think.

C
I think this will help, or give me your email via pm (4MB pdf)

denis
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Old 20th February 2014, 07:09 PM   #1145
dsdjoy is offline dsdjoy  Germany
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Quote:
Originally Posted by CeeVee View Post
yep!..be carefull that you have the power supply adapted for the relays you intend to use!...you can use whatever voltage you want; 12V or 24 but power supply has to correspond.
I want to re-emphesize the suggestion of CeeVee, because I learned that the hard way with Cheff UGS amp.

The 'default' BOM and Premp has one flaw: The logic&relais power supply can not cope with all possible choice of parts. Load on the 78xx can also be too high. It depends on what display and relais you choose.

In my case, I chose a VFD Display. The load on the 7809 and it's dissipation was high. Both the transformer and the 7809 got very warm, and so the power supply died within the first year. After power supply repair, the 7809 died a bit later.

Since I didn't want to give up the nice VFD display and the already soldered relais, I decided to change from 78xx to DC/DC converters. The lower dissipation loss of the DC-DC converters solved my problems - power section stays cool.
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Old 21st February 2014, 02:24 AM   #1146
NYCOne is offline NYCOne  United States
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Has anyone thought about a new group buy? This still seems like a wonderful preamp
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Old 4th March 2014, 02:04 PM   #1147
Stealth is offline Stealth  Slovakia
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Quote:
Originally Posted by dsdjoy View Post
Since I didn't want to give up the nice VFD display and the already soldered relais, I decided to change from 78xx to DC/DC converters. The lower dissipation loss of the DC-DC converters solved my problems - power section stays cool.
I think the VFD with 78xx doesn't work well, I've got a DC/DC TracoPower also
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Old 5th March 2014, 10:14 AM   #1148
potepuh is offline potepuh  Slovenia
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Has anyone thought about a new group buy? This still seems like a wonderful preamp
I am interested, anyone elese
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Old 5th March 2014, 10:17 AM   #1149
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The ugs boards needs redesign to accept 2sk170/2sj74, so we need at least that.

I'd be interested in some boards too!
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Old 5th March 2014, 09:39 PM   #1150
NYCOne is offline NYCOne  United States
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Interested
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