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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Eliminating series resistor at line output?
Eliminating series resistor at line output?
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Old 13th November 2010, 01:38 AM   #11
Bonsai is offline Bonsai  Europe
Account disabled at member's request
Join Date: Jul 2003
Location: Europe
"Output current is limited in most opamps anyway (OPA2134, LM833, TL071 all indicate this on the datasheet), so a short shouldn't be fatal should it? "

Most monolithic op-amps can take an indefinite short circuit on the output without damage or degradation. You need to check the data sheet though. They will run hot in this condition, so its generally a thermal issue, rather than an electrical over stress (EOS) issue.
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Old 13th November 2010, 01:11 PM   #12
Omega_Void is offline Omega_Void  United Kingdom
diyAudio Member
Join Date: Oct 2007
Location: Still stuck in Cheltenham :(
Originally Posted by DF96 View Post
A transformer will also, to some extent, transform the capacitive reactance although leakage inductance and transformer resonances will confuse the issue.
Yes, I dropped by Maplin this morning and got them to let me use their fancy DMM to measure L and C in the transformer.

Plugging the values into LTspice, it looks like the HV winding(s) will not be suitable for an output. The AF response starts to become dependent on cable characteristics with more than a few meters of toilet-venue grade cable. So a step-up configuration is ruled out anyway.

Thanks for the responses, it's helped me in thinking this through. Especially to Bonsai for telling how to do it. It may still come in handy one day.
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