VBITNGC building & comment

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#201
They look nice Hanzwillem.

Today i get ready withe the PSU board and tested the delaypart of the PSU board. It work perfectly, after 12 seconds the relais is switching the power on for the amps.

12 seconds is the maximum i get (i used the potemer of course)

If not long enough, how to get the time longer?
 
#203
Well the "original concept" was a small(tiny) tube buffered amp.
That concept was good, but the execution was slightly flawed / bugged.
Click to expand...

Exactly, Troy, I could subscribe this statement! It is designed as small and tiny amp.

I am willing to help Zang to develop this concept resp. to eliminate some bugs and maybe add some more flexibility.

But I will retire of this project soon. I like audio as hobby, but not as obligation. I am not really interested to produce kits and fullfill other DIY'selfers needs.

Zang will be absolutely free to further use and develop this concept.

Additionally: I have a complete solution, one pcb for regulated psu, tube buffer and LM3875 including delay switch. But on this board, the relay does not have to switch heavy loads, it is just grounding the LM3875's input during startup.

I offer the design for everyone who is able to further refine it and possibly wants to offer group buys.

Keep on audio!
Franz
 

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#204
... more than one year ago, one member here asked to buy a gainclone:

http://www.diyaudio.com/forums/showthread.php?s=&threadid=40671&highlight=

Nobody answered him. But I made for him a tube buffered gainclone, based on the showed pcb in the last posting.

He is still happy with this amp, compared it to Krells and other good brands.

I did not make one amp, but two. The first for me, as prototype, the second for him.

Here, how my prototype looks like.

Franz
 

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#205
rabstg said:
Well the "original concept" was a small(tiny) tube buffered amp.
That concept was good, but the execution was slightly flawed / bugged.

I personnaly was going to build this to use on my desk @ work so size does matter.

If your going to break away from the tiny concept, it is my SUGGESTION that the amp be designed for a generic enclosure. Something that everyone has access to such as the Hammond boxes.

And I would still like to build one for my desk. 🙂
Click to expand...


Hi troy,
I am very happy to hear you suggestions. a generic enclosure design should be helpful assemble this project.infact when I seen Hanzwillem's amp enclosure I have realized it.
Hammond enclosure is a good choice,anybody have the other enclosure choose?

troy,can you give the part number of hammond enclosure you are going to use?

P.S.
to all,if I design a combine amp pcb,what size is easy?

Zang
 
#206
I.m.o. a euroformat is the most flexible format. It means that the PCB is 160 mm x 100 mm. You will need 2 PCB's for a compleet amp/PSU, but you can mount them obove eachother in one eurocardformat enclosure like the Conrad enclosures i named a few posts earlyer. They look proffessional and are aluminium with heatsink surface.

But there are many other brands of eurocard format enclosures. Most of them have sleeves inside were you can shove the cards in and above eachother.

For Troy: Eurofomat is small and you can easely use them as a desktop beside your computer or whatever. Naturally i do not know if you like these boxes. Its a matter of taste.
 
#207
Besides the led that indicates power on the PSU PCB i add a led that glows up when the relais gives power on the amp. So the second led glows about 20 seconds after the first one. The orriginal led will be red, the second green. Idee? (Just for fun, its no big deal).
 
#208
I think the euro format is excellent.
in my earlier post ( http://www.diyaudio.com/forums/showthread.php?postid=787622#post787622 ) you can see 100x40mm is about the minimum surface to stuff proper connectors.
The LED idea is neat. I used it in my 6-channel HV voltage for my final project at my university. See the photo's here:
Gainclone on steroids
(btw, also check the pic above that one)

I just switched red and green, since I wanted to make some sort of warning when high voltage can be present on the outputs 🙂 With your amp, that is not the case of course 🙂

good luck finishing your amp!

prettige jaarwisseling,
Hans-Willem
 
#210
"For Troy: Eurofomat is small and you can easely use them as a desktop beside your computer or whatever. Naturally i do not know if you like these boxes. Its a matter of taste."

I do like those boxes, they are VERY similar to the Hammond I was referring to.

However that one has a removable top panel, which the Hammond does not. I would actually prefer yours.

Do you happen to know if they are available in the US?
 
#212
Besides the led that indicates power on the PSU PCB i add a led that glows up when the relais gives power on the amp.
Click to expand...

A good idea. But there is still a better solution: during delay, there is a voltage between pin 3 and the ground as during this phase, pin 3 shows the voltage from pin4.

So, you can add a red or flashing LED between pin 3 and ground to signalize the delay is working and the green LED in parallel to the relay.

Franz
 
#213
Franz G said:


A good idea. But there is still a better solution: during delay, there is a voltage between pin 3 and the ground as during this phase, pin 3 shows the voltage from pin4.

So, you can add a red or flashing LED between pin 3 and ground to signalize the delay is working and the green LED in parallel to the relay.

Franz
Click to expand...


Yeah, pimp my PSU with three different coloured LEDs :clown:
 
#216
Troy, the enclosures that i was talking about hase the brand ISEL and i think they sell in de US also. Look at internet. i searched with google on te words "enclosure isel" and found many english spoken sites, mayby also in te US. Succes.
 
#218
Not realy an issue Zang, i build a gainclone earlyer with 2X LM3875 in such a conrad enclosure 55 mm high, and i play for more than a year very often many hours very loud. No heat problem at all. LM3875 do not need very big heatsinks.
 
#220
digi01 said:
Troy,
have you used 1455 Series?
http://www.hammondmfg.com/1455.htm
I think 1455N*** is cool.
Click to expand...


I did see those, but the tops do not come off such as the Conrad case so placing the board and aligning a tube socket and hole would be dificult.

After thinking about this for a while, I think a generic PCB such as your IGC and reg boards would be the best option. Then they could be adapted to any suitable enclosure.

Franz concept was great, but he built it around a specific enclosure. I think we have now left that concept and it should now be a generic board anyone can adapt to their enclosure.

I am disapointed that I will not have one of the "smallest tube buffered GC's in the world" because I thought Franz's was very cute, but the reality is that I just want GOOD sound @ my desk in a "smallish" package.
 
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