Simplistic MosFET HV Shunt Regs

[Salas]

What help you need? You must know what voltage and current your circuits will need and then to set the regs. The R1 for mA and trimmer for B+. Like in LV1.

 

[merlin el mago]

An externally hosted image should be here but it was not working when we last tested it.

 

[Salas]

Make the standard example, feed it 275V, set it 260V. Drop with RC for 220V first stage. 48k, 47uF.

 

[merlin el mago]

Wich post 966 or 967?

 

[Salas]

966=967 without protective Zeners. If you don't normally mishandle, 966 is less components when P2P, easier.

 

[merlin el mago]

Make the standard example, feed it 275V, set it 260V. Drop with RC for 220V first stage. 48k, 47uF.

966=967 without protective Zeners. If you don't normally mishandle, 966 is less components when P2P, easier.

Thank you Salas, for B+ 165V?

 

[adamus]

salas, i dont have any irf9610 but do have 9630's. do you think they will work (i see people are using the 9620 ok, but the 9630 looks untested.

 

[Salas]

I see no reason why it would not work. Report back if it will so people will know about that one too.

 

[merlin el mago]

Thank you Salas, for B+ 165V?

How I have to modify this schematic for B+ 165V, if I have 180V rectified & filtered?

 

[quanghao]

How I have to modify this schematic for B+ 165V, if I have 180V rectified & filtered?

Hi! you use
AC= 160-180V
or after filter ( before SSHV) 185-200 VDC
R4= 100k
R5= 2.2K

All it is good for Iv DAC-end wit transformer tube E182cc!

 

[merlin el mago]

Hi Quang Hao,

I use 180V in DC rectified & filtered, I want to get 165V DC regulated

An externally hosted image should be here but it was not working when we last tested it.

It's OK?

 

[quanghao]

Hi Quang Hao,

I use 180V in DC rectified & filtered, I want to get 165V DC regulated

An externally hosted image should be here but it was not working when we last tested it.

It's OK?

No good!
need 165 v-out, you set before SSHV min 185V, but int this option,
It it is better more 185v, about 190 VDC

 

[merlin el mago]

I can't change Vin 180V, how can get 165Vout?

 

[merlin el mago]

Anybody can help me please?

 

[adamus]

you probably cant with any useful result. for the reg to function it needs minimum voltage drop. you could probably get away with 155v out.

 

[merlin el mago]

I have a Tx with 240VAC see under pic

An externally hosted image should be here but it was not working when we last tested it.

The PSU have a a CRC 220uF/15K/220uF so changing the 15K resistor for a lower value can get enough voltage to get 180 Vout I tried Duncan PSUd2 butcan not reach to simulate the needed resistor to increase the voltage before the reg.

 

[adamus]

change the resistor to a lower value and you will easily have enough Vout.

make sure you then change the resistor to bias the heater supply to the correct V.

one thing to watch, you power tx will be supplying significantly more current with a shunt reg... are you sure it can handle it?

 

[merlin el mago]

change the resistor to a lower value and you will easily have enough Vout.

make sure you then change the resistor to bias the heater supply to the correct V.

one thing to watch, you power tx will be supplying significantly more current with a shunt reg... are you sure it can handle it?

You are right, but I have no idea to calculate the right resistor value without change bias for heater supply, how can calculate?

 

[Salas]

The MJE's resistor is better at 5K6. If having 180V in its enough for having stable 165Vout. Use the reg's trimmer to adjust. The trimmer has its middle pin connected to its lower pin. Rheostat. Measure drop across 15K. Drop/15K=Running current. Adjust value using Ohm's law for whatever you need.

 

[adamus]

Edit - double post, see next post