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-   -   getting ready build first amp, newbe questions (http://www.diyaudio.com/forums/solid-state/88501-getting-ready-build-first-amp-newbe-questions.html)

j_dunavin 18th October 2006 06:49 PM

getting ready build first amp, newbe questions
 
I'm going to build amp project number three out of the "high power audio amplifer construction manual"

The auther does specify what size of resistors ( power rating) to use in the last stages, like 2W resistor here, 5W there. So should i just use 1/4 W when not specified or should i go with 1/2 W? And what do you guys use for resistors, just plane ol carbon resistors?

XEAGLEKEEPER 18th October 2006 10:18 PM

I'd go with 1/4 watt metal film unless otherwise specified.Metal films are not as noisey as carbon resistors.

j_dunavin 18th October 2006 10:24 PM

really metal film hu? and 1/4W will be fine?
Another question i thought of was, since this design in the book is just a power amp, can i place like a 10K pot on the input for volume controll, or do i need to implement a pre amp stage? I really wish i could scan the schematic in , but i don't have a scaner. BUT the input stage doesn't look like it needs a pre amp to dilver enough voltage the output transistors.

XEAGLEKEEPER 19th October 2006 01:46 AM

What kind of power does this amplifier boast?

XEAGLEKEEPER 19th October 2006 02:00 AM

I am a preamp firm believer. But passive volume control is possible.But I think you will be disappointed with its performance.Have you checked out ESP http://sound.au.com. He (Rod) has some awesome amps. If you purchase pcboards from him he provides excellent and detailed instructions as well as tons of techsupport .

j_dunavin 19th October 2006 04:15 AM

see i duno about the power output. In the project before he says 150W then in the project after he talkes about 200W, so i would guess somewhere in between.
And yes i have looked at the projects over there at ESP. They do look nice and since i have no real experiance as of yet.... perhapes i should try one of his designs first. At least with the preamp.


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