Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

ACA illustrated build guide
ACA illustrated build guide
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
Reply
 
Thread Tools Search this Thread
Old 22nd April 2017, 08:28 AM   #131
kapalin is offline kapalin
diyAudio Member
 
Join Date: Apr 2017
Ok values of R7,R8 and R14 does not measure correctly, let me change those and update you all. Thank you.
  Reply With Quote
Old 22nd April 2017, 04:23 PM   #132
kapalin is offline kapalin
diyAudio Member
 
Join Date: Apr 2017
No luck, the output resistor R14 does not measure to 1K it always show as zero value when connected. Before connecting I get 0.98k, not sure why this behaviour.
  Reply With Quote
Old 22nd April 2017, 06:33 PM   #133
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
ACA illustrated build guide
check for shorts , especially if you have big washers underside the pcb
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 17th August 2017, 12:19 PM   #134
apaulr is offline apaulr  United States
diyAudio Member
 
Join Date: Jan 2007
Hi everyone. Is it normal to get "thump" from the speakers when the amps are turned off? My Tannoys are very efficient and they sure exaggerate this sound . Should I be concerned?
  Reply With Quote
Old 17th August 2017, 12:38 PM   #135
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
ACA illustrated build guide
naah ...
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 17th August 2017, 05:19 PM   #136
Eric is offline Eric  United States
diyAudio Member
 
Eric's Avatar
 
Join Date: Nov 2000
Location: Central PA, USA
ACA illustrated build guide
I have two ACA builds, one makes a small thump at power off, the other doesn't. I've attributed this to the specific laptop power brick that each uses since they are different. Everything else is the same.

As for why kapalin's build doesn't work, check a few things. Make sure you have no cold solder joints. Make sure you didn't mix up Q3 and Q4 locations. Double check each pin on both mosfets with your DMM to make sure there is not something grounding them to the heatsink. Each should measure as an open loop. Also, check your screws/nuts where the PCB is mounted to the sink to make sure nothing is grounding or allowing a resistor tail to hit the sink.

The beauty of this circuit is its simplicity. It makes trouble shooting easy compared to the more complex designs because there are fewer things to check.
__________________
My DIY Basement Theater, Aleph-X Amps, Avro Open Baffle Speakers, LDR based DCB1 + BA-3 pre, Pearl II, highly modded Technics SL-1200, F4, a40, several ACAs, FHXL, Tang Band 1772 bass-reflex
  Reply With Quote
Old 21st August 2017, 10:21 PM   #137
tipatina is offline tipatina  United States
diyAudio Member
 
Join Date: Oct 2016
Location: Birmingham, AL
RCA Jacks: Has anyone noticed the RCA jacks are relatively shallow? I can't get any of my RCA cables all the way in. They do go in enough to work though.

Power Supplies: Has anyone built or bought 17V linear power supplies for these? Did it make an audible difference?
  Reply With Quote
Old 15th May 2018, 08:19 PM   #138
SHN is offline SHN  Canada
diyAudio Member
 
Join Date: Mar 2014
Quote:
Originally Posted by Eric View Post
I've attributed this to the specific laptop power brick that each uses since they are different. Everything else is the same.
So are you actually using a 24 V laptop PS on the 5 W amp? I am planning on using one of my old 24 V/4.7 A laptop power supply on my ACA 1.5 5 W amp in order to boost it's output to 6 W but I am not sure if that will cause any problem.
  Reply With Quote

Reply


ACA illustrated build guideHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Aleph J illustrated build guide 6L6 Pass Labs 2662 13th June 2018 08:37 AM
diyAudio Power Supply Circuit Board v3 illustrated build guide 6L6 Power Supplies 680 10th June 2018 04:26 PM
An illustrated guide to building an F5 6L6 Pass Labs 999 30th May 2018 10:33 PM
Illustrated guide to the 4U deluxe Chassis 6L6 Parts 13 15th May 2018 08:12 AM
Illustrated guide to the 4U deluxe Chassis 6L6 Pass Labs 3 16th November 2013 04:32 PM


New To Site? Need Help?

All times are GMT. The time now is 10:10 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki