2x D200 + 12V SMPS amp ;)

simingx · 14th April 2009, 02:09 PM

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...

Eva · 15th April 2009, 05:25 AM

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.

simingx · 15th April 2009, 06:29 AM

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?

Eva · 15th April 2009, 06:31 AM

Consider wiring inductance (and it's antenna effect...)

Did you design the SMPS?

simingx · 15th April 2009, 07:16 AM

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.

AUDISOUL · 25th March 2010, 09:12 AM

Hi simingx,

Which amp do you used? put schematics here

81bas · 25th March 2010, 10:23 AM

Quote:

Originally Posted by AUDISOUL

Hi simingx,

Which amp do you used? put schematics here

imPULSE D-200 Class D Amplifiers RedRocks digital amplifier company | Class D amplifier

15th April 2009, 05:25 AM	#2
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	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. __________________ I use to feel like the small child in The Emperor's New Clothes tale

15th April 2009, 06:31 AM	#4
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Consider wiring inductance (and it's antenna effect...) Did you design the SMPS? __________________ I use to feel like the small child in The Emperor's New Clothes tale

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15th April 2009, 06:29 AM	#3
simingx diyAudio Member Join Date: Mar 2005 Location: 01°17.5319' N, 103°48.2319' E	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?

15th April 2009, 07:16 AM	#5
simingx diyAudio Member Join Date: Mar 2005 Location: 01°17.5319' N, 103°48.2319' E	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.

25th March 2010, 09:12 AM	#6
AUDISOUL diyAudio Member Join Date: Dec 2008	Hi simingx, Which amp do you used? put schematics here

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