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Switchable Hi-Z input impedance, how ?
Switchable Hi-Z input impedance, how ?
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Old 28th November 2012, 04:05 PM   #411
tinitus is offline tinitus  Europe
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Switchable Hi-Z input impedance, how ?
got the 2sk117 today

what else are they good at ? suggestions welcome
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Old 29th November 2012, 07:43 PM   #412
tinitus is offline tinitus  Europe
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Switchable Hi-Z input impedance, how ?
power supply...maybe
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Old 6th December 2012, 07:54 AM   #413
tinitus is offline tinitus  Europe
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Switchable Hi-Z input impedance, how ?
thinking about dumping the LM regulators
and run the 'sensitive' single j310 gain stages directly from caps smoothing only
at least I won't have to worry about 'unstable' power supply

and the TO-92 regs might just be able to bring it down to the other needed +/-12V

or... would it still be better to use two different print trafos, and dump all regs entirely
but those small trafos ? I dont know....with their 'different regulation' it could be tricky without regulator
at least I know the voltage on the C-core I already have
and with its 1.5A rating it won't change voltage one bit
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Old 6th December 2012, 08:23 AM   #414
tinitus is offline tinitus  Europe
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Switchable Hi-Z input impedance, how ?
and there might be one big advantage without the LM regs
reason, the HV positive regs all the way made my ground appear...problematic

and the advantage without, I can use seperate diode bridges
I suppose thats a very good thing if you have 'sensitive' curcuits

and maybe especially in this case, mixing SE and symmetric curcuits
and I will only need to buy one type supply cap, 50 small ones are cheaper
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Old 12th December 2012, 11:13 AM   #415
tinitus is offline tinitus  Europe
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Switchable Hi-Z input impedance, how ?
another box in the works
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Old 15th December 2012, 08:56 AM   #416
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Switchable Hi-Z input impedance, how ?
and its a match
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Old 15th December 2012, 11:46 AM   #417
tinitus is offline tinitus  Europe
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Switchable Hi-Z input impedance, how ?
look here what I just found
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Old 15th December 2012, 01:01 PM   #418
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Switchable Hi-Z input impedance, how ?
and using the big hammer.....nah, fits like a glove
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Old 18th December 2012, 04:41 PM   #419
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Switchable Hi-Z input impedance, how ?
got a few needed parts today
making square holes in back panel
and its much easier than most think
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Old 18th December 2012, 05:37 PM   #420
shanx is offline shanx  Canada
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Quote:
look here what I just found Click the image to open in full size. Attached Thumbnails Click the image to open in full size.
Hey I could use that, if you are throwing it away!
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