nope
what you need is 600:15K (nominally) , which gives you voltage ratio of 1:5
with classic repeater (150 x 4 ,usually connected as 600ct:600ct ) , you can get max voltage ratio of 1:3 , if you use one 150R winding as primary , rest connected in series as secondary ...... with drekload of resulting problems
what you need is 600:15K (nominally) , which gives you voltage ratio of 1:5
with classic repeater (150 x 4 ,usually connected as 600ct:600ct ) , you can get max voltage ratio of 1:3 , if you use one 150R winding as primary , rest connected in series as secondary ...... with drekload of resulting problems
I am gathering parts in preparation for this build. I have read several different PSU capacitor ratings so far. Will a 22,000uF + qnty 2 x 4700uF (~31,000uF) per rail be enough for two channels, or will I need double this and make two mono PSU's?
I will use 400VA 18vac trafo for both channels.
I will use 400VA 18vac trafo for both channels.
Teabag's M2 - First Sound
This amp was a joy to build. Simple simple simple compared to many of the class AB amps I have worked on.
Completed pair of Teabag M2's:
It seems to be running at 1.3A bias current, and the neat thing was to see it start low, and rise fairly quickly once warmed up. I guess had I been listening I would have heard it go through class B, then class AB, then class A
Even with the 52.3k resistor on R7, I could not get the DC offset to zero out. It's bottoming out at -95mV. However, that's not going to stop me from listening.
I am using my existing PSU but with a new 400VA 18vac trafo which makes exactly 25.0vdc rails. Ripple is 56mV with CRCLC filter ending with 20mF of small 1k cap bank and about 29mF total per rail.
This amp puts out some heat on these slightly undersized heatsinks.
Still listening to it but sounds very good so far. Wish it had more gain
This amp was a joy to build. Simple simple simple compared to many of the class AB amps I have worked on.
Completed pair of Teabag M2's:
It seems to be running at 1.3A bias current, and the neat thing was to see it start low, and rise fairly quickly once warmed up. I guess had I been listening I would have heard it go through class B, then class AB, then class A
Even with the 52.3k resistor on R7, I could not get the DC offset to zero out. It's bottoming out at -95mV. However, that's not going to stop me from listening.
I am using my existing PSU but with a new 400VA 18vac trafo which makes exactly 25.0vdc rails. Ripple is 56mV with CRCLC filter ending with 20mF of small 1k cap bank and about 29mF total per rail.
This amp puts out some heat on these slightly undersized heatsinks.
Still listening to it but sounds very good so far. Wish it had more gain
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is this your first FW clone build? for sure it wont be the lastThis amp was a joy to build. Simple simple simple compared to many of the class AB amps I have worked on.
It seems to be running at 1.3A bias current, and the neat thing was to see it start low, and rise fairly quickly once warmed up. I guess had I been listening I would have heard it go through class B, then class AB, then class A
Even with the 52.3k resistor on R7, I could not get the DC offset to zero out. It's bottoming out at -95mV. However, that's not going to stop me from listening.
I am using my existing PSU but with a new 400VA 18vac trafo which makes exactly 25.0vdc rails. Ripple is 56mV with CRCLC filter ending with 20mF of small 1k cap bank and about 29mF total per rail.
This amp puts out some heat on these slightly undersized heatsinks.
Still listening to it but sounds very good so far. Wish it had more gain
Opposite way that I never build class ab due to its complicated schematic.I use 2 paralel 100k for R6 and R7, default DC after soldering around +400mV but after trimming multiturn trimpot, I can get close to 1mV, even down to -30mV on my testing
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The Edcor's are not expensive and shipping to Canada shouldn't be more than $15 for something like this. Have you tried ordering direct from Edcor's website?
Funny you mention word "Furnace" because I was quite unprepared for how much heat a pair of little IRFP's can put out when running pure class A.
Funny you mention word "Furnace" because I was quite unprepared for how much heat a pair of little IRFP's can put out when running pure class A.
You could almost slow cook food
But it's not recommended
