HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  RESOURCE CENTER  |  INDUSTRIES
REGISTER   |   LOGIN   |   HELP
Blogs
Blog

CASE # 55: Gary Liked to Pump Up the Volume

NO RATINGS

Ever turned on your car stereo and BOOM! the woofers unexpectedly jumped out for one filling-loosening bass note? Just great, you've just been diagnosed with turn-on thump — either due to an amp that never had a muting circuit or one that's failed open circuit. Either way, OUCH! To fix this problem, Gary built a circuit that connects externally to any car audio amplifier and keeps his speakers completely disconnected from his amplifier until it's been completely powered up. Plus, it also works with a mis-matched set of amplifiers.

For Gary Reck's complete instructions to build a customizable audio amplifier muting circuit, click here.

Customizable Audio Amplifier Muting Circuit Parts List
Amt Part Description Allied Part #
1 Darlington Driver Array 248-2007
1 Single Supply Quad Comparator 568-4666
1 General Purpose Diode 568-0144
1 Capacitor 47 uF, 25V, 20 percent 852-7078
1 Resistor 10K 895-0355
1 Resistor 38.3K 895-1159
1 Resistor 7.5K 895-0833
1 Resistor 1M 895-1141
1 Resistor 681K 895-1108
1 Relay, SPDT, 12V dc Coil, 15A Contacts 850-0205
1 Relay, DPDT, 12V dc Coil, 15A Contacts 850-0410
1 Fuse 5A, PCB Mount 846-2014
1 Fuse .125A, PCB Mount 846-2002
Additional parts required: For a list of optional parts, go to http://rbi.ims.ca/4919-505.
View Comments: Newest First | Oldest First | Threaded View
Partner Zone
More Blogs
We follow up our original slideshow with contributions from our messy readers.
Safety networks have become more complex, and have actually become simpler and easier to deploy for plant operators. This slideshow highlights developments in plant safety with an emphasis on integrated safety networks.
As the MEMS industry spans a myriad of industries and markets, the future of MEMS in consumer electronics will enable a myriad of functionality, applications, and personalization.
The next great engineering advancement in batteries is in the lab and it is tantalizingly close to solution.
The Nest is a sleek-looking digital thermostat which can actually "learn" its owners' schedule and then continue to regulate temperature to suit the user's preferences and patterns.
Quick Poll
Design News Webinar Series
12/28/20119:00am PT / 12:00pm ET
12/27/20119:00 AM PT / 12:00 PM ET
12/16/20119:00 AM ET
11/18/2011
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Feb 13 - 17, Sensors


DN Radio
Sponsored by
NEXT UPCOMING BROADCAST
Embedded Angles for Medical Products
February 21, 2pm EST Tuesday
Thanks to embedded electronics, medical devices are getting smaller and smarter than ever. Pacemakers and implantable defibrillators are now able to call physicians. MRIs, CT scanners, and ultrasound machines are gaining mobility. And the venerable Band-Aid may soon be able to detect illnesses ranging from fevers to heart arrhythmias. On February 21, join Design News senior editor Charles Murray for a wide-ranging discussion, "Embedded Angles for Medical Products," which will explore the latest developments in medical electronics. The discussion will examine advances in medical device technology and offer an inside look at the embedded electronics behind it.
February 23, 2pm EST Thursday
3D CAD & Visualization
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Engineering Careers
Jobs sponsored by
Copyright © 2012 UBM Electronics, A UBM company, All rights reserved. Privacy Policy | Terms of Service