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Old 31st August 2005, 04:35 AM   #11
Arius is offline Arius  United States
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I like the heavy duty RIFA caps and they can't be found with lower ratings. 63 V is a bit little when you have 24 VAC => 2 x 24 x 1.4 Volts.
Duh! I did forget something. Diodes/caps in a bridge sees twice the voltage. My GC is OK. Running 2 X 22VAC but my soon to be ready Leach clone has 100V caps off 40V AC rails (rest of PSU caps are 63V). I'll get that fixed. Thanks.

Back to the topic, I tried fiddling with a SMD layout for GC but found that it's hard to be more compact than my current layout using 1206 resistors & other SMD parts.

The attached placement has a Zobel, both high/low freq decoupling caps, bypassed feedback cap, input HF filter all in a nice, tight space.
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Old 31st August 2005, 05:24 AM   #12
alexw88 is offline alexw88  Hong Kong
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I am also making a PA150 board with SMD parts :

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Old 31st August 2005, 07:23 AM   #13
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Looks nice and I see you are also brave using SMD parts.
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Old 1st September 2005, 02:22 AM   #14
Ipanema is offline Ipanema  Malaysia
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Hi Alexw88,

What is PA150? and what is the function of trimpot on your board?

Thanks.
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Old 1st September 2005, 02:35 AM   #15
alexw88 is offline alexw88  Hong Kong
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PA150 means three 3886 paralleled, able to deliver ~150W into 2 ohms.

It is an inverted configuration, the trimmer is to adjust the DC offset. I measured the DC offset to be < 1mV after adjusting each trimmer.

My plan is to bridge 2 of these broads using DRV134, to deliver 300W into 4 ohms.

P.S. I have to admit that most of the idea came from this Jeff Rowland Model 10, which also use SMD parts.

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Old 1st September 2005, 03:03 AM   #16
Ipanema is offline Ipanema  Malaysia
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Would you mind to post your PA150 schematic over here?

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Old 1st September 2005, 04:44 AM   #17
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I think you can guess it. Count the parts and place them in a schematic.
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Old 1st September 2005, 02:16 PM   #18
alexw88 is offline alexw88  Hong Kong
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As P-A said, it is quite simple. You may already guessed what the schematic look like.
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Old 18th April 2017, 07:36 PM   #19
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Originally Posted by Ipanema View Post
Hi,

I am building my GC with SMD components, since GC sounds better with short signal path and less parasitics compoents as some claims. I know this is nothing new.

Pls advise me on the type of SMD resistor / capacitor that will sounds good for GC. I have in mind to use 1206 size thick film resistor and 0.1uF ceramic capacitor for PS decoupling since 1206 size is easier to handle by my hand.

I also come across thin film resistor, which is more expensive. May I know what is the difference between thick film and thin film or is there any other types of SMD resistor worth considering?

As for capacitor, some tantalum SMD types claim to have very low ESR. Will this be better than ceramic SMD?

Thanks for your advise.

This topic was open almost 12 years ago. Today, what do you think about SMD audio caps?
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Old 19th April 2017, 11:43 AM   #20
AndrewT is offline AndrewT  Scotland
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NP0 ceramic are even more available for audio duty.
X7R are still available for local supply rail decoupling.
Both of the above are now widely available in MLCC and give much higher capacitances than were available 12years ago.
Metal film in 1% are more widely available but there is a big variation in pricing.
Metal film 0.1% are still expensive, but fortunately only required in very few locations.
Metal oxide 1% 100ppm/C or 150ppm/C have become more available at quite cheap pricing.
Take care to check datasheet for maximum voltage and maximum dissipation. You do not want to get to close to their limits and amp performance is demonstrably better if you operate well below maximum limits.

There are a few doing film caps in smd, but they are difficult to find stockists and prices can be high due to low turnover.
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