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madbeanpedals::forum

Projects => VFE Projects => Topic started by: jimilee on April 26, 2020, 03:05:54 AM

Title: Vfe zener cap combination. I can’t see what’s going on there on both the Tractor Beam and Bumble Bee
Post by: jimilee on April 26, 2020, 03:05:54 AM
Vfe zener cap combination. I can't see what's going on there on both the Tractor Beam and Bumble Bee. Is the cap just paralleled with the zener?


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Title: Re: Vfe zener cap combination. I can’t see what’s going on there on both the Tractor Beam and Bumble
Post by: jimilee on April 29, 2020, 08:11:36 PM
bump
Title: Re: Vfe zener cap combination. I can’t see what’s going on there on both the Tractor Beam and Bumble
Post by: jubal81 on April 29, 2020, 08:27:09 PM
It's a cheap voltage regulator. The combination is used to make reference and bias voltages for the JFETs. You wouldn't want to use a resistor divider there because the supply voltage can fluctuate with battery life or different DC supplies. The parallel cap it to reduce noise on the VREF.


Here's some info (https://www.electronics-tutorials.ws/diode/diode_7.html?nab=1&utm_referrer=https%3A%2F%2Fwww.google.com%2F) you want to read more about zoners as voltage regulators.
Title: Re: Vfe zener cap combination. I can’t see what’s going on there on both the Tractor Beam and Bumble
Post by: jimilee on April 29, 2020, 08:32:42 PM
thank you sir.
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