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Old 7th November 2009, 12:09 PM   #391
JeroenR is offline JeroenR  Netherlands
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Thank you very much for the help.

I have 2 boards, 4 vishay's and 7 schottky's so I will need to use them both in sets of 4. The vishay's were indeed left over from a tube project.

The 1N4007 already went in.

Thanks,

Jeroen
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Old 11th November 2009, 10:48 PM   #392
Tea-Bag is offline Tea-Bag  United States
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Default T-Bag DCB1 build

So I thought I would share my humble building skills so others don't feel embarrased to show there's.

Here is a photo of the DCB1 guts, and the unit running in a chassis, a recycles network WAN router chassis. Radio Shack knobs.
I did run the wires a bit shorter before enclosing, and chucked the female connectors.

Happy building.
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File Type: jpg Mesmerize_ 019s.jpg (39.3 KB, 715 views)
File Type: jpg Mesmerize_3s.jpg (40.9 KB, 711 views)
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Old 11th November 2009, 10:51 PM   #393
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for the show and tell... Good work OM
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Old 11th November 2009, 11:00 PM   #394
Salas is offline Salas  Greece
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Funky industrial! I dig TB.
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Old 12th November 2009, 12:28 AM   #395
grufti is offline grufti  United States
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Very nice. I like it.

Is that an extra small red capacitor in the top right hand corner of your picture?

And it sometimes shows that English is not my native language, in this case I don't know what you mean by: "... chucked the female connectors." Discarded ... nah? ... but what?

I am still waiting for enclosure inspiration, and waiting, and waiting.




Quote:
Originally Posted by Tea-Bag View Post
So I thought I would share my humble building skills so others don't feel embarrased to show there's.

Here is a photo of the DCB1 guts, and the unit running in a chassis, a recycles network WAN router chassis. Radio Shack knobs.
I did run the wires a bit shorter before enclosing, and chucked the female connectors.

Happy building.
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Old 12th November 2009, 12:38 AM   #396
Tea-Bag is offline Tea-Bag  United States
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Hi Grufti. I had trouble myself with the friction connectors (the white things on inputs). I got rid of them and did some direct soldering to the male lugs. I guess if I were to do it over, I would use just 24-28ga wire to the pcb, because I dont have a good handle on those things.
The red thing is a PRP resistor, used between the outputs, which I use up to 3. I've heard it can help with noise between amps. There is not one on the mid/upper range amp.
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Old 12th November 2009, 02:54 AM   #397
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Tea-Bag,
Thank you for putting up your DCB1 photos. You and Robert Pease build fine bird nests. If I can do as well I will be happy.
I stumbled into this DCB1 late. I am still not totally sure where the buffer fits into the chain of components for my fellow DIYers. This thing has a voltage gain of one. It has “low” output impedance. It has a current gain greater than 1. Toss in an attenuator and a selector switch that makes it better than a passive preamplifier. If it will swing several volts I will screw it down to a bread board and try it as a driver for a vacuum tube Single End Triode. The vacuum tube amplifier on the bread board does not need voltage gain, just current.
Where are you all using this thing?
DualTriode
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Old 12th November 2009, 03:11 AM   #398
Salas is offline Salas  Greece
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I have seen it swinging clean up to its rails on the scope. Those are 40V NJFETS so it can go 80Vpp with +/-40V PSU's. Only use TO-92 mini sinks beyond +/- 20V regs.
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Old 12th November 2009, 11:26 AM   #399
Ian444 is offline Ian444  Australia
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My IRFP devices from ebay arrived today, 10 x IRFP9240 and 4 x IRFP240, USD$2 each, the IRFP240 look OK, but I'm not sure about the IRFP9240. They were sold to me as International Rectifier devices. My opinion only, I am concerned that the device on the left may not be the real thing. The IRFP9240 I used in the proto PCB were sourced in Australia where I live and cost AUD$8.95 each, and they have silk-screened (or printed) characters and logo, but this new lot from Hong Kong has etched characters and logo. However the IRFP240 from the same seller are not etched and look similar to the ones I sourced locally. Any comments welcome...
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Old 12th November 2009, 11:46 AM   #400
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be sure both of them are original.. there are many fake toshibas and hitachis but IRFP's are ok (it is not worth to produce fake IRFP because they are cheap enough )

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