winner

Is it possible to add more pointing modes to U87 like this?
« on: December 10, 2020, 05:04:54 AM »
I want to add more modes to U87 based on the directivity schematic of U89. Although they look similar, I’m not sure if this is possible.
This is the schematic I redrawn


winner

Re: Is it possible to add more pointing modes to U87 like this?
« Reply #1 on: December 10, 2020, 05:05:29 AM »
This is the original U87 schematic

winner

Re: Is it possible to add more pointing modes to U87 like this?
« Reply #2 on: December 10, 2020, 05:06:48 AM »
This is the original U89 schematic
Thanks everyone for your help :) :)

Khron

Re: Is it possible to add more pointing modes to U87 like this?
« Reply #3 on: December 10, 2020, 05:19:34 AM »
Technically, that's the U87A schematic. But sure, I don't see why not. You'll notice that, despite that they're not used, the bias voltage generator still also contains the parts for the lower voltages as well. All you need is a 5-6 position switch.
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winner

Re: Is it possible to add more pointing modes to U87 like this?
« Reply #4 on: December 25, 2020, 06:57:26 AM »
Technically, that's the U87A schematic. But sure, I don't see why not. You'll notice that, despite that they're not used, the bias voltage generator still also contains the parts for the lower voltages as well. All you need is a 5-6 position switch.
Thank you for your patient answer. In my opinion, the two schematic diagrams have different capsules, and the schematic diagram of U89 has an extra resistor with R1 resistance value of 1G. I don’t understand the connection between them and the working principle , Sorry, I have so many questions

Khron

Re: Is it possible to add more pointing modes to U87 like this?
« Reply #5 on: December 25, 2020, 08:44:15 AM »
Perhaps you're overthinking this?
Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans


 

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