Author Topic: How is this -11V regulated  (Read 861 times)

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Offline MitiTopic starter

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How is this -11V regulated
« on: February 06, 2020, 01:55:24 pm »
Good day All,

I cant really understand how this -11V is regulated in the IFR2025 RF signal generator. Can anybody explain it to me? Shouldn't be a Zenner or something in the base or it is more like a filter? TR202 is the regulator.
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Offline schmitt trigger

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Re: How is this -11V regulated
« Reply #1 on: February 06, 2020, 02:10:56 pm »
The circuit shown is clearly labeled "-11v filtering", and not "-11v regulator".

The transistor capacitor arrangement is a capacitance multiplier, plus all the other caps downstream.

With the limited information afforded by a truncated schematic view, it appears that either:
a) the -11v value is only nominal,
b) the -11v value has been regulated upstream.
 
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Offline MitiTopic starter

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Re: How is this -11V regulated
« Reply #2 on: February 06, 2020, 04:21:08 pm »
Thanks for pointing the obvious! I got stuck trying to understand the circuit and didn’t even read the note.  :palm:
The input is -12V and because all the other voltages are properly regulated, I expected -11 to be regulated as well but seems like it is not very critical.
Capacitance multiplier... cool.
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