a few pics of my amp

Tensop · 13th May 2004, 11:45 PM

hey, finally got hold of a (crappy) kodak dc3400 digicam.. the amp is an sc480 kitamp from jaycar in vic.. specs are 0.03%THD @ 50w/8r
psu consists of 150va, 9400uF capacitance per amp, so 20,000uF and 300va in total.. sounds very nice but a bit weak in the low end

Tensop · 13th May 2004, 11:48 PM

li_gangyi · 14th May 2004, 05:33 AM

wonderful job...wonder why it's weak on the low end...might be due to the input cap?

Tensop · 14th May 2004, 06:26 AM

Doubt its due to the capacitors, the roll off chart is only about -2dB @ 10hz

and my mistake - its actually 9400uF per rail(10,000uF when taking the pcb mounted parallel cap) so 40,000uF all up. the low frequencies are extremely clear, best i've heard from an amp yet but a bit too quiet. when i get the time i'll clean up the wiring and use some shielded inputs to the amp, to get rid of the slight high frequency interference im getting, maybe put a grounded shield around the transformers to isolate them too?

and, as a great source for mains cables i took the powersupply cable from an old AT computer case, it has an earth shield all through the inside(foil and braided wire), even had an earth lug on the end!

13th May 2004, 11:45 PM	#1
Tensop diyAudio Member Join Date: Jul 2003 Location: Chapel St.	a few pics of my amp hey, finally got hold of a (crappy) kodak dc3400 digicam.. the amp is an sc480 kitamp from jaycar in vic.. specs are 0.03%THD @ 50w/8r psu consists of 150va, 9400uF capacitance per amp, so 20,000uF and 300va in total.. sounds very nice but a bit weak in the low end

14th May 2004, 05:33 AM	#3
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	wonderful job...wonder why it's weak on the low end...might be due to the input cap? __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

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13th May 2004, 11:48 PM	#2
Tensop diyAudio Member Join Date: Jul 2003 Location: Chapel St.

14th May 2004, 06:26 AM	#4
Tensop diyAudio Member Join Date: Jul 2003 Location: Chapel St.	Doubt its due to the capacitors, the roll off chart is only about -2dB @ 10hz and my mistake - its actually 9400uF per rail(10,000uF when taking the pcb mounted parallel cap) so 40,000uF all up. the low frequencies are extremely clear, best i've heard from an amp yet but a bit too quiet. when i get the time i'll clean up the wiring and use some shielded inputs to the amp, to get rid of the slight high frequency interference im getting, maybe put a grounded shield around the transformers to isolate them too? and, as a great source for mains cables i took the powersupply cable from an old AT computer case, it has an earth shield all through the inside(foil and braided wire), even had an earth lug on the end!

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