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Chip Amps Amplifiers based on integrated circuits

gainclone vs. symasym amp
gainclone vs. symasym amp
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Old 13th December 2006, 01:50 PM   #11
BlacK_Chicken is offline BlacK_Chicken  Germany
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Default right decision!

Hello,

I Think you'll be fine with that setup.

The LMs are really easy to start. If you like you can have my board layout, wich I posted on "hifi-forum". A little practise in etching boards comes in handy for the symasym.

I will start my own symasym (has been planned long before the K+T-article) these days now. But still, the symasym is far more expensive than a gainclone. One MJL for 6.20 Euros, means I could buy 5 Gainclone-Chips for the price of 4 outputtransistors for the symasym.

BTW if you are taking more Quality Parts on the Board the symasym is way more expensive than stated in the Article in K+T (i.e. they buy their Trannys bei "reichelt" and use the BC-types. I had very bad experiences with their power-transistors, in my first discrete designs.)


Good Luck!

Black
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Old 13th December 2006, 02:16 PM   #12
student is offline student  Austria
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hi

another really simple question

how much watts should have my soldering station ?
at the moment i have a single 15 watts soldering-stick.

i could buy a 10 watts station with a regulator for 100°-400° temp for 40 €.

is that quite enough or do i need more watts ?
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Old 13th December 2006, 04:19 PM   #13
peranders is offline peranders  Sweden
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gainclone vs. symasym amp
10 or 15 Watts is not much if you want to solder everything in an amp. I have 50 and 80 W temp controlled soldering irons.
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Old 13th December 2006, 04:53 PM   #14
BlacK_Chicken is offline BlacK_Chicken  Germany
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Default definately more!

Hello

I do have a second soldering Iron, ERSA 25W, but I do only use it for really small components on PCB, soldering a mains Fuse/plug or something else that big is impossible.

I also do have another 80W unregulated for these jobs, to be honest I only use the big one...

BTW more power is a plus, many parts can stand high temperature only for short time-period. The more power you have to heat your Part (R, C, IC) the faster your soldering is done and its less harmful for your component.

Greets
Black
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Old 14th December 2006, 10:10 AM   #15
student is offline student  Austria
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ok thx

i'll buy a soldering station this week and maybe the parts for the gainclone amp.

do i need a professionally corroded circuit board for the gainclone or can i connect the parts with isolated wires at the back ?
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Old 14th December 2006, 10:14 AM   #16
student is offline student  Austria
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http://cgi.ebay.de/Platine-Chipverst...mZ290036837978

is this circuit board ok for the gainclone ?
cause i heard that one resistor should be placed as near as possible to the lm3886 chip.

wich circuit borad would you advise ?
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Old 14th December 2006, 06:43 PM   #17
BlacK_Chicken is offline BlacK_Chicken  Germany
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If you dont like to etch your own, I would give them a try. Very Cheap.

In my layout, I am mounting the sensible feed-back resistors on the copper side, directly under the chip. This insures the shortest distance, same as with ptp-wirering.

Greets
Black
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Old 14th December 2006, 07:09 PM   #18
student is offline student  Austria
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thx

ill buy a normal circuit board which is unconnected at the back. is the cheapest method.

i think a good soldered self made circuit board with isolated wires at the back side as connection of the electronic parts will work as good as such a "professional" made circuid board.

frage, darf man hier auch auf deutsch schreiben ?
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Old 14th December 2006, 07:21 PM   #19
darkfenriz is offline darkfenriz  Poland
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Old 14th December 2006, 07:44 PM   #20
student is offline student  Austria
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na geh ;(
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