Hello All,
I’ve been planning to build another power supply for a Royer Mod mic but wanted to deviate from the original passive/linear supply. I want to easily adjust HV and Heater voltages.
In the thread, "DIY Tube Mic project," @thor.zmt posted information on a HV module utilizing a MC34063 IC that looked interesting to me so I ordered a couple of them.
![HV-PowerSupplyKit.PNG HV-PowerSupplyKit.PNG](https://cdn.imagearchive.com/groupdiy/data/attachments/83/83866-9e3766ed004429abb21cf20e4fe505c9.jpg)
After getting the module built, I set it to provide 100VDC by using a value of 51K for Rx. I put together a breadboard version of the Royer Mod microphone section with a 5840 pentode.
'Scoping the HV line I'm getting this sawtooth ripple riding on top of the 100 Volts. It measures 2Vp-p with a 4mS period on my old and probably uncalibrated Tek T922 ‘scope.
![2Vp2p-5mSecPerDiv.png 2Vp2p-5mSecPerDiv.png](https://cdn.imagearchive.com/groupdiy/data/attachments/83/83867-8a627402bf9822dc66513a492120f9b7.jpg)
To minimize the ripple I put together a CR-CR-CR-CR filter from parts I had on hand:
![CRCRCRCR-filter.PNG CRCRCRCR-filter.PNG](https://cdn.imagearchive.com/groupdiy/data/attachments/83/83870-9bb5016ede763ef0809dab9f1f0be7d2.jpg)
My question is there a better way to do this?
Thanks!
I’ve been planning to build another power supply for a Royer Mod mic but wanted to deviate from the original passive/linear supply. I want to easily adjust HV and Heater voltages.
In the thread, "DIY Tube Mic project," @thor.zmt posted information on a HV module utilizing a MC34063 IC that looked interesting to me so I ordered a couple of them.
![HV-PowerSupplyKit.PNG HV-PowerSupplyKit.PNG](https://cdn.imagearchive.com/groupdiy/data/attachments/83/83866-9e3766ed004429abb21cf20e4fe505c9.jpg)
After getting the module built, I set it to provide 100VDC by using a value of 51K for Rx. I put together a breadboard version of the Royer Mod microphone section with a 5840 pentode.
'Scoping the HV line I'm getting this sawtooth ripple riding on top of the 100 Volts. It measures 2Vp-p with a 4mS period on my old and probably uncalibrated Tek T922 ‘scope.
![2Vp2p-5mSecPerDiv.png 2Vp2p-5mSecPerDiv.png](https://cdn.imagearchive.com/groupdiy/data/attachments/83/83867-8a627402bf9822dc66513a492120f9b7.jpg)
To minimize the ripple I put together a CR-CR-CR-CR filter from parts I had on hand:
![CRCRCRCR-filter.PNG CRCRCRCR-filter.PNG](https://cdn.imagearchive.com/groupdiy/data/attachments/83/83870-9bb5016ede763ef0809dab9f1f0be7d2.jpg)
My question is there a better way to do this?
Thanks!