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||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.|