A75 questions.

JoeBob · 8th November 2001, 04:13 AM

Alright, I've heard that the passlabs A75 is simple enough and is a good design. My question, is how much do you think it would cost me to build? I found the PCBs for 9$ and 15$ for the PSU and the amps respectively. I'd build the case myself, as well as the heatsinks (I've been building CPU heatsinks for a while (overclocker ones, very LARGE and efficient, ie high quality copper ones, amp heatsinks should be a nobrainer). So I'm just asking for a ballpark figure for the electronic components. Because I'm only a poor student, and if it racks up a huge bill, then I'd have to unfortunately have to put this project on the back burner for a while (just built some expensive speakers, so I'm not swimming in cash). Thanks...

cp642 · 8th November 2001, 12:32 PM

for starters...do check out the prices for the MOSFETS as you'll need more than necessary for matching purposes.

Probably the most expensive hardware in the A75 could be the transformers, since you're making the housing and heatsinks yourself. But do shop around for surplus parts (e.g large caps or transformers) as they're much cheaper than buying new. Be prepared to spend a few hundred dollars.

diy student · 9th November 2001, 04:53 PM

Check out avnetmarshall.com and felectronics.com for good prices on mosfets for the A75 if you can get a small enough quantity. If you can't afford the A75 check out maybe the Aleph 3 or the Aleph 5 (service manuals are on the passlabs website), the circuits there are simple as well.

Nelson Pass · 12th November 2001, 06:59 PM

Also, you can easily build the A75 with half as many
outputs, and it still works great.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Some Quad els57 questions! - Novice Questions!	Fanuc	Planars & Exotics	13	5th December 2007 09:26 AM
PSU for QSC amp questions	rkc7	Parts	5	10th November 2005 05:18 PM
Last questions about this	Madmike2	Multi-Way	9	13th June 2005 11:12 PM
Questions, questions, from newb DIYer	Phatman91624	Multi-Way	41	3rd August 2002 02:52 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

8th November 2001, 04:13 AM	#1
JoeBob diyAudio Member Join Date: Nov 2001 Location: Montreal, Canada	Alright, I've heard that the passlabs A75 is simple enough and is a good design. My question, is how much do you think it would cost me to build? I found the PCBs for 9$ and 15$ for the PSU and the amps respectively. I'd build the case myself, as well as the heatsinks (I've been building CPU heatsinks for a while (overclocker ones, very LARGE and efficient, ie high quality copper ones, amp heatsinks should be a nobrainer). So I'm just asking for a ballpark figure for the electronic components. Because I'm only a poor student, and if it racks up a huge bill, then I'd have to unfortunately have to put this project on the back burner for a while (just built some expensive speakers, so I'm not swimming in cash). Thanks...

8th November 2001, 12:32 PM	#2
cp642 diyAudio Member Join Date: Aug 2001	for starters...do check out the prices for the MOSFETS as you'll need more than necessary for matching purposes. Probably the most expensive hardware in the A75 could be the transformers, since you're making the housing and heatsinks yourself. But do shop around for surplus parts (e.g large caps or transformers) as they're much cheaper than buying new. Be prepared to spend a few hundred dollars.

9th November 2001, 04:53 PM	#3
diy student diyAudio Member Join Date: Aug 2001 Location: Indiana	Check out avnetmarshall.com and felectronics.com for good prices on mosfets for the A75 if you can get a small enough quantity. If you can't afford the A75 check out maybe the Aleph 3 or the Aleph 5 (service manuals are on the passlabs website), the circuits there are simple as well.

12th November 2001, 06:59 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	Also, you can easily build the A75 with half as many outputs, and it still works great.