Simple Symetrical Amplifier - Page 122

guitar89 · 31st October 2011, 04:50 PM

Quote:

Originally Posted by Nico Ras

IN 4004/7 is fine.. You can easily mount it on the heat sink placing the two diodes under a suitable large washer and screwing them down on with a single screw. Use a little silicon grease to make a good thermal contact.

What I found 1n4004/7 are axial package, no TO-220 or similar package(flat surface), thus hard to mount on heatsink and difficult to transfer heatsink fully ?

Bigun · 31st October 2011, 04:59 PM

I've used silicone glue to glue temperature sensing devices directly to the package of the power transistor. This glue is good for use at high temperatures and does not get brittle with age. No screws were necessary so it would probably work with any device package.

Sheldon · 31st October 2011, 05:44 PM

Quote:

Originally Posted by guitar89

If were to use diode, what diode are recommended ? (specs, type) Is this ok ? ON SEMICONDUCTOR|MBR1545CTG|DIODE, SCHOTTKY, 15A, 45V, TO | element14 Malaysia

No, you want a standard type diode, not schottky. Regular or fast recovery is fine. May not find those in flat package, so Nico's or Bigun's mounting suggestions might be easiest. I think the diode in the thermaltrak is equivalent to MUR120, so something with specs. similar to that will work.

Sheldon

Salas · 31st October 2011, 11:29 PM

Guys, does anybody know a source for THAT140 matched quad or similar? Such would sort out the SSA nicely I suppose. Can see BC847BPN on Mouser for dual but its diminutive to handle and don't state matched.

Joachim Gerhard · 31st October 2011, 11:52 PM

THAT Corporation Distributors

guitar89 · 31st October 2011, 11:57 PM

Quote:

Originally Posted by Sheldon

No, you want a standard type diode, not schottky. Regular or fast recovery is fine. May not find those in flat package, so Nico's or Bigun's mounting suggestions might be easiest. I think the diode in the thermaltrak is equivalent to MUR120, so something with specs. similar to that will work.

Sheldon

Well..... I don't like gluing things, and like to have full contact.(flat surface)
Anyway, if there is no flat surface for me, I have this thing, is it usable in here ?
http://docs-asia.electrocomponents.c...6b803a9cb4.pdf

Salas · 1st November 2011, 12:05 AM

Thanks J. Requested THAT340. Lets see what they respond.

Joachim Gerhard · 1st November 2011, 12:08 AM

I use That 1200. I got it fast and easy.

Salas · 1st November 2011, 12:15 AM

Did you check out 380G array also? Nice for your BJT phonos. Don't know how they package it though.

Idefixes · 1st November 2011, 12:44 AM

According LC schematic in this post :Simple Symetrical Amplifier
Here my interpretation from ThermalTrak SSA (need to be verify)

NJL are mounted underbord as driver (2SC2911/2SA1209).

What about choice between NJL3281/1302 and NJL4281/4302?

Marc

31st October 2011, 04:59 PM	#1212
Bigun diyAudio Member Join Date: Jan 2009 Blog Entries: 2	I've used silicone glue to glue temperature sensing devices directly to the package of the power transistor. This glue is good for use at high temperatures and does not get brittle with age. No screws were necessary so it would probably work with any device package. __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

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31st October 2011, 11:29 PM	#1214
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Guys, does anybody know a source for THAT140 matched quad or similar? Such would sort out the SSA nicely I suppose. Can see BC847BPN on Mouser for dual but its diminutive to handle and don't state matched.

31st October 2011, 11:52 PM	#1215
Joachim Gerhard diyAudio Member Join Date: Mar 2009	THAT Corporation Distributors

1st November 2011, 12:05 AM	#1217
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Thanks J. Requested THAT340. Lets see what they respond.

1st November 2011, 12:08 AM	#1218
Joachim Gerhard diyAudio Member Join Date: Mar 2009	I use That 1200. I got it fast and easy.

1st November 2011, 12:15 AM	#1219
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Did you check out 380G array also? Nice for your BJT phonos. Don't know how they package it though.