There are 3 star's +70, -70 and ground, these star's are on the board, and that is where the capacitors connect (and every thing else). This thing is unconventional 🙂 and designed to be unconventional.
I'm curious if connecting that first filter cap in each case via bus bars to the others would result in a reduction in rectification (100/120Hz) noise. Usually I have found that directly connecting those "noisy" nodes from the rectifier to the stars is a bad idea. I'll be following your progress closely! 🙂
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Very nice lab space, very cool builds. Those VU beg for tear down and FDW in deville font printed on their clean space. FG to 0.5MHZ only? 0.005% THD alright but some faster pulse edge would be needed in the future...
When finished the front panel will be in line with this All sizes | RIAA Preamplifier | Flickr - Photo Sharing! the cover and back panel will be perforated steal, this steal will be, chrome, copper, bronze or yellow-copper plated 🙂, you have to remember, this is 'only' the proto type 🙂
The imprinted text will (most probably) be this:
Signature Transresistance Current-Feedback BIGBT Amplifier - Frans de Wit
With thanks to 'Lazy Cat' 🙂 (also note that this is not a SSA or comparable design)
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You're using LazyCat's balanced compound blocks ?
Been counting the power device pairs under the board, but still fail to spot any ménage-à-trois business going on.
Not using fancy emitter resistors, are you ?
Been counting the power device pairs under the board, but still fail to spot any ménage-à-trois business going on.
Not using fancy emitter resistors, are you ?
Cool Frans, the amp looks good.
I like the "flying" screen in your lab.
I have seen part of the circuitry of Frans amp and it is innovative.
The main issue is ( was ? ) to stabilize it because it is a VFA with a CFB "flavour" .
When Frans broke the loop on the simulator i could have sworn that the input stage is VFB and the output stage CFB.
That 1.45kHz does not have a particular reason. I could have taken 1kHz. More taxing would be a double tone, say 19kHz plus 20kHz.
I like the "flying" screen in your lab.
I have seen part of the circuitry of Frans amp and it is innovative.
The main issue is ( was ? ) to stabilize it because it is a VFA with a CFB "flavour" .
When Frans broke the loop on the simulator i could have sworn that the input stage is VFB and the output stage CFB.
That 1.45kHz does not have a particular reason. I could have taken 1kHz. More taxing would be a double tone, say 19kHz plus 20kHz.
You have to find your driving boots, this thing is singing like a thousand-and-one Nightingales.
Sfernice RTO-20 (the 0R5/20W)
Board looks difficult to mount, with 8 power devices on one side, and 8 emitter resistors on the other side of the aluminum blocks.
(lange imbus-sleutel, zeker ?
)
Board looks difficult to mount, with 8 power devices on one side, and 8 emitter resistors on the other side of the aluminum blocks.
(lange imbus-sleutel, zeker ?
)
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