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Old 23rd Jan 2020, 3:28 pm   #31
golexica
Triode
 
Join Date: Jan 2020
Location: London, UK.
Posts: 41
Default Re: Cossor CRO 3100 Timebase unit repair (model #3122)

Quote:
Originally Posted by golexica View Post
edit, math wrong, probably an ESR change < 5ohms
I mean impedence not esr, sorry.

to get a 1ohm impedance at 35mhz requires ~5nH, not taking into account trace impedance and the such. with all that, more than 10nH doesn't seem implausible, causing several ohms worth of impedance?

Forgot to take into account the DC balance, but it still applies - The capacitor is connected to both, so the ripple would effect both roughly equally, and there's a differential amplifier, so the difference would change by a similar factor?

someone who's better at analog circuitry than me help me out here XD

Last edited by golexica; 23rd Jan 2020 at 3:54 pm.
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