SlewMaster Builds

[vzaichenko]

Q104 needs to be mounted on the main heatsink so it can measure the output
device temperature. Q103 measures the driver temperature.

Almost same time

 

[maxwell007]

OK guys..many thanks

 

[maxwell007]

I've little bit lost ... is it there some PCB for IPS available?

 

[jwilhelm]

I have some Spooky boards left. I'll have Kypton-ND boards in a couple weeks too.

 

[maxwell007]

Great....Just ping me if you have Krypton boards available...many thanks

 

[maxwell007]

just thinking about layout... this is case from 100V amp...

 

[smartx21]

just thinking about layout... this is case from 100V amp...

First attempt seems more suitable for that case.
How about placing another fan on the other (front) side (same flow direction)?
I would place transformers in the front part, and PSU boards on rear.
Just 2 cents.

 

[maxwell007]

1st case is like original... air flow from front to rear.... 2nd case separate transformers

 

[vargasmongo3435]

hello guys question will it make any difference if I use 10 ohm resistors on the bass of BJT power audio transistors instead of traditional 4.7 ohms? just a curiosity thinking

 

[jkuetemann]

Using 10R for base stoppers might be on the high side and values too high cause issues of their own. If I were choosing a substitute value I'd go lower, down as low as 2R2.

 

[vargasmongo3435]

Using 10R for base stoppers might be on the high side and values too high cause issues of their own. If I were choosing a substitute value I'd go lower, down as low as 2R2.

thanks JK I do have 2R2



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[vargasmongo3435]

hello guys I'm about tho purchase a toroidal transformer from AnTek and is for two Arc Welder 5P OPS SlewMaster PCB what voltage seconday and VA you guys recomended? I'm thinking to keep at least 60 to 65 VDC after rectification and filtering



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[rsavas]

60 x 0.7071 = 42.426V, so you could use a 90VCT at what ever VA rating that you can afford, 500-1500VA depends on if mono-block construction.
I do not see one at AnTek, I do see a few a Digikey, not cheap
Power Transformers | Transformers | DigiKey

 

[vargasmongo3435]

60 x 0.7071 = 42.426V, so you could use a 90VCT at what ever VA rating that you can afford, 500-1500VA depends on if mono-block construction.

oh, I must be doing the formula wrong I always use 1.414 x one of the secondary voltage example 45V x 1.4142 = 63.63 DC with filter caps always goes up 5 more volts so I assume if 90VCT is a one that has two 45V AC secondary windings right? oh yes is for stereo I don't think I'm gonna be pushing this amplifier to much base on this a 600VA and 45V - 0 - 45 AC will be fine?

CT





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[rsavas]

The transformers are rated for o/p V at full load and then you add the regulation % factor to figure out no-load V. You have some loss through the rectifiers.
Look at the datasheets for the ones I showed you a link too, they should explain it better for you.
What are you using for AC rectification/filtering? I made up a cheap pcb design for my testing.

 

[vargasmongo3435]

The transformers are rated for o/p V at full load and then you add the regulation % factor to figure out no-load V. You have some loss through the rectifiers.
Look at the datasheets for the ones I showed you a link too, they should explain it better for you.
What are you using for AC rectification/filtering? I made up a cheap pcb design for my testing.

yes I have a power supply that I design with a friend of mine Mr. ST = stuart and this power supply is multipurpose one single bridge can be use or two bridge "by wire can be set up that" all caps are 15,000uF 100V oh I saw the link so 50V? ok I was thinking 45V but if you say 50V I guess I will go for that then thank you for the info



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[rsavas]

Where is Mr. ST, the PS designer, to answer your ?'s
Big supply, it has soft-start? speaker protection too? other ckts?

 

[vargasmongo3435]

Where is Mr. ST, the PS designer, to answer your ?'s
Big supply, it has soft-start? speaker protection too? other ckts?

Er
YES I design all those circuits

 

[evanc]

I have 4 channels of slewemaster mono blocks running right now. Two are "arc welders". They use antek transformers 600 VA. I believe they are 58 Volt. Rails measure at +/-82VDC.

 

[vargasmongo3435]

I have 4 channels of slew master mono blocks running right now. Two are "arc welders". They use antek transformers 600 VA. I believe they are 58 Volt. Rails measure at +/-82VDC.

that is awesome man hey I just want it to show you the soft star the circuit is from diyaudio I just re-change the layout for my use also I have the new circuit that Mr. Ostripper design the Greenamp circuit version 1.2 VFA topology I have problems cause the LED that I order were reversed cathode and anode but all is fine I fix the problem and sound really good also I have the speaker protection PCB too oh I'm not by any means an engineer I'm just a fanatic of audio amplifier designs I think this year I finally gonna complete a complete audio amplifier



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