Hello Oliver,
i have a strange behaviour of the shunt: it is supposed that i have a Vin and a Vout, let's say that i have 240v Vin, if i adjust the trimmer to have Vout=220 the Vin drops down and Vout is always approx Vin-2v
any ideas?
Did you solder the MJE350 in the right way? Look at my photos. Perhaps you could post a photo of your pcb.
What is that teflon FT1 like cap in the output doing? How is it wired?
Uhh... What is that?
It should look like this:
An externally hosted image should be here but it was not working when we last tested it.
it is shunted to the k75-10 in the output stage, after the tubes as is supposed to be...What is that teflon FT1 like cap in the output doing? How is it wired?
output of the shunt goes to tb1, jumpered to tb2, like your pics
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Oliver,
Regarding i/v resistors. I am thinking about the values. Did you try different values yet? I know that Lukasz Fikus's excitement about this circuit (which is why we're all making it, let's be honest) was with using 100R i/v resistor for a single dac, which is about twice the 56R value recommended here. What i the reasoning behind the given values please? I am due to fire up very soon (just waiting on the teralink X2 now ) and I have 27Rs installed in the Tub-I-Zator, but I'm not sure why not Fikus's 50R...
Excitedly, Lucas
Regarding i/v resistors. I am thinking about the values. Did you try different values yet? I know that Lukasz Fikus's excitement about this circuit (which is why we're all making it, let's be honest) was with using 100R i/v resistor for a single dac, which is about twice the 56R value recommended here. What i the reasoning behind the given values please? I am due to fire up very soon (just waiting on the teralink X2 now ) and I have 27Rs installed in the Tub-I-Zator, but I'm not sure why not Fikus's 50R...
Excitedly, Lucas
Oliver,
Regarding i/v resistors. I am thinking about the values. Did you try different values yet? I know that Lukasz Fikus's excitement about this circuit (which is why we're all making it, let's be honest) was with using 100R i/v resistor for a single dac, which is about twice the 56R value recommended here. What i the reasoning behind the given values please? I am due to fire up very soon (just waiting on the teralink X2 now ) and I have 27Rs installed in the Tub-I-Zator, but I'm not sure why not Fikus's 50R...
Excitedly, Lucas
The TDA1541A has a typical full scale current of 4mA. with the 56R you get a max. output voltage 224mV amplified by x100 (6N2P).
That´s more than enough output voltage
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