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Old 14th April 2009, 02:09 PM   #1
simingx is offline simingx  Singapore
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Default 2x D200 + 12V SMPS amp ;)

Talk about a tight fit...

CD jewel case is for scale.
Should I join the input 0V/output common together at the PSU?
I don't suppose it's a good idea to let the ground current flow through the RCA jacks...
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Old 15th April 2009, 05:25 AM   #2
Eva is offline Eva  Spain
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You should only couple grounds at high frequencies to handle common-mode EMI (major source is parasitic capacitances in the transformer). 1nF to 10nF should be enough. Coupling them to the heatsink in the same way is recommended too (to control EMI produced by capacitance between transistors and heatsink). Adding a high value resistor like 10K to 100K between grounds is a good idea too, to keep them at the same DC potential when RCAs are not connected.
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Old 15th April 2009, 06:29 AM   #3
simingx is offline simingx  Singapore
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Hi Eva,
Thanks for the input.

Won't the RCAs be connected to chassis ground via the headunit, bypassing whatever capacitance is used to couple them? Or is this OK because the amplifier ground is separated from the vehicle ground otherwise?
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Old 15th April 2009, 06:31 AM   #4
Eva is offline Eva  Spain
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Consider wiring inductance (and it's antenna effect...)

Did you design the SMPS?
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Old 15th April 2009, 07:16 AM   #5
simingx is offline simingx  Singapore
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Nope, the SMPS is from another thread here by "Audisoul", but the schematic is similar to the one at Elliott Sound Products... a simple unregulated SG3525 circuit.
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Old 25th March 2010, 09:12 AM   #6
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Hi simingx,

Which amp do you used? put schematics here
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Old 25th March 2010, 10:23 AM   #7
81bas is offline 81bas  Germany
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Quote:
Originally Posted by AUDISOUL View Post
Hi simingx,

Which amp do you used? put schematics here
imPULSE D-200 Class D Amplifiers RedRocks digital amplifier company | Class D amplifier

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