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calculation of resistor value in CR circuit of B+
calculation of resistor value in CR circuit of B+
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Old 21st July 2019, 03:13 PM   #1
classicyip is offline classicyip
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Default calculation of resistor value in CR circuit of B+

hey folks, I wanna ask for advice.
Let say if I am making a SET of 2A3 driven by 6SH7,
and I wanna make a power supply for both 320V and 180V, using capacitor and resistor circuit to "drop" the 320V to 180V?
how can I accurately calculate the resistor value for it ?

thanks
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Old 21st July 2019, 06:36 PM   #2
pinholer is offline pinholer  Canada
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Assuming that the 6SH7 is operating in triode mode and the plate current is 10 mA, then using Ohm's Law (R = V / I):

R = (320 - 180) / 0.01= 14 000 or 14k ohms

The operating point of the 6SH7 in your circuit may be different, so you may have to recalculate using your actual operating current.
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Old 22nd July 2019, 02:35 AM   #3
classicyip is offline classicyip
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thx pinholer, but let say the circuit shown below , the math doesnt work ;
the voltage drop at 6SL7 end is too small if use of the presumed current draw by 6SL7 x tWO 2k2 resistor ........

Click the image to open in full size.
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Old 22nd July 2019, 02:38 AM   #4
Salas is offline Salas  Greece
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calculation of resistor value in CR circuit of B+
It does not show up. Better not [IMG] but attach and upload.
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Old 22nd July 2019, 03:45 AM   #5
classicyip is offline classicyip
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thank you, here is the schematic
Attached Images
File Type: gif AudioMirror6AS7PSE_v6_PSU-2.GIF (12.3 KB, 47 views)
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Old 22nd July 2019, 04:09 AM   #6
JMFahey is online now JMFahey  Argentina
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Quote:
Originally Posted by classicyip View Post
thx pinholer, but let say the circuit shown below , the math doesnt work ;
the voltage drop at 6SL7 end is too small if use of the presumed current draw by 6SL7 x tWO 2k2 resistor ........
Why would it?
You ask about:
Quote:
320V and 180V .... 6SH7 ....
calculation of resistor value in CR circuit of B+-audiomirror6as7pse_v6_psu-2-gif
While your schematic shows:
* NO 6SH7
* NO 320V
* NO 180V

anywhere.
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Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.

Last edited by JMFahey; 22nd July 2019 at 04:11 AM.
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Old 22nd July 2019, 09:49 AM   #7
DF96 is offline DF96  England
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Quote:
Originally Posted by classicyip
the voltage drop at 6SL7 end is too small if use of the presumed current draw by 6SL7 x tWO 2k2 resistor ........
What current draw do you presume for a 6SL7? What has that got to do with your circuit?
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