Skip to content
View in the app

A better way to browse. Learn more.
www.Head-Case.org

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.

goldenreference high voltage power supply (GRHV)

Pars
in Do It Yourself

Featured Replies

 

On 8/19/2025 at 11:00 AM, psyduck said:

Hello @jamesmking. How is the current limit calculated from the current sense resistor?

on the golden reference HV you need enough voltage across the 5.1ohm 5W current sense resistor (R11 on the positive rail) to activate the current limit. 

*If* I remember correctly the stock 5.1 Ohm gives about 90mA and 2.6ohm (two 5.1ohms in parallel) gives about 175mA.

V(drop)=IR so you are looking at about 0.09A*5.1Ohm = ~0.46V to activate the current limiter so

V/I = R 0.46V/your required current in A = current senses resistor in ohms. 

This resistor value will probably need some fine tuning and you ideally want to use a 5W part rated for high voltage.

 

Edited by jamesmking

    • Thanks 1
    • Replies 150
    • Views 58.7k
    • Created
    • Last Reply

    Top Posters In This Topic

    Popular Days

    Most Popular Posts

    • jamesmking
      jamesmking

      My guide to golden reference high voltage (grhv) variants   Here is my attempt at documenting some of the different GRHV board variations. (this will be work in progress for sometime) f

    • justin
      justin

      Taking a photo of new boards before blowing them up later tonight they are: top - 2x 5V linear supplies 300B/20B cathode/plate cathode servo +/-12, +12 linear supply 2x G

    • Kerry
      Kerry

      I’ve been using fqpf8n80c with my miniature miniaturized (smaller than the group buy version) Golden reference supplies. I also have the negative supply GRHV79 working in there too.

    Posted Images

    Please sign in to comment

    You will be able to leave a comment after signing in

    Sign In Now
    Go to topic listing

    Important Information

    By using this site, you agree to our Terms of Use.

    I accept

    Account

    Navigation

    Search

    Search

    Configure browser push notifications
    Chrome (Android)
    1. Tap the lock icon next to the address bar.
    2. Tap Permissions → Notifications.
    3. Adjust your preference.
    Chrome (Desktop)
    1. Click the padlock icon in the address bar.
    2. Select Site settings.
    3. Find Notifications and adjust your preference.