SKA sponsored Audio Forum - New 100W amp design

Dan Giovanni SKA Owner Offline Posts: 166 Cheltenham Country: United Kingdom	Re: New 100W amp design Reply #10 - Mar 09^th, 2010, 8:54pm Looking forward to lots of specs Greg. "Very good bias stability" sounds appealing at the moment
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Greg B. Administrator Offline audio hostage Posts: 3292 Kota Kinabalu, Sabah Country: Malaysia	Re: New 100W amp design Reply #11 - Mar 11^th, 2010, 7:57am Hi Dan, I understand. I am fine tuning the sims at the moment with different devices/models hoping to achieve similar specs to the GB150D. Greg
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StuH SKA Owner Offline Posts: 195 Country: United Kingdom	Re: New 100W amp design Reply #12 - Mar 11^th, 2010, 8:04pm Apart from the power output how is this going to compare to the GB150?
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Greg B. Administrator Offline audio hostage Posts: 3292 Kota Kinabalu, Sabah Country: Malaysia	Re: New 100W amp design Reply #13 - Mar 12^th, 2010, 7:41am Hi StuH, I'm trying to achieve similar sim results to the GB150D. At present I have - Frequency Response: 3.5Hz - 2.5MHz. ( no input filter) THD: < 0.004 % at 50Wrms 8ohm load 1KHz @ 100mA bias (2nd/3rd equal) PSRR 108 dB decreasing to 92 dB at 20K. Greg
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mikeg SKA Owner Offline Posts: 286 Minnesota USA Country: Unknown	Re: New 100W amp design Reply #14 - Mar 12^th, 2010, 7:45am Can't you do better than that? Joke
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Greg B. Administrator Offline audio hostage Posts: 3292 Kota Kinabalu, Sabah Country: Malaysia	Re: New 100W amp design Reply #15 - Mar 12^th, 2010, 8:08am Maybe too many bits in the way - I'll take some out and try again. Greg
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FBS Member Offline Posts: 1 Country: UnitedStates	Re: New 100W amp design Reply #16 - Mar 13^th, 2010, 10:12pm Hi Greg, When do you think the GB 100 will be available?
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Greg B. Administrator Offline audio hostage Posts: 3292 Kota Kinabalu, Sabah Country: Malaysia	Re: New 100W amp design Reply #17 - Mar 13^th, 2010, 11:43pm Hi FBS, Within a couple of weeks I would hope. Greg
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mikesnowdon SKA Owner Offline Posts: 346 London Country: United Kingdom	Re: New 100W amp design Reply #18 - Mar 15^th, 2010, 3:26am Hi Greg, So to clarify, this is a smaller 100w version of he GB150d? Will it have the same or similar sound as the 150d? Is it capacitor coupled, ie; input and feedback caps to reduce DC offset? What raw dc supply voltage would it need to produce the max 100w into 8ohm load?
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Greg B.

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audio hostage

Posts: 3292
Kota Kinabalu, Sabah

Country: Malaysia

Re: New 100W amp design
Reply #19 - Mar 16^th, 2010, 10:27am

Hi Mike,

Quote:

So to clarify, this is a smaller 100w version of he GB150d?

Not really. It is capable of similar power but would need +/-5V higher supplies. If substituted on an existing GB150D build, the gain is the same but power would be approx 30W less. It makes for a good comparison as it is physically compatible and the same gain.

Quote:

Will it have the same or similar sound as the 150d?

Unknown. Inasmuch as the specs I am aiming for are very similar and it is very similar in having a complementary LTP input and vertical MOSFET output.

Quote:

Is it capacitor coupled, ie; input and feedback caps to reduce DC offset?

Yes, as for the GB150D provision is made for both.

Quote:

What raw dc supply voltage would it need to produce the max 100w into 8ohm load?

I would use a +/-50V supply.

Greg

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