I bought the two voltage converters, any suggestion as to what 9v transformer?Here is a simple low cost solution that works:
What you need is
- A transformer with two separate 9 volts windings (1 Amp recommended)
- Two bridge rectifiers
- Two capacitors 1000µF/25 V.
- Two of these voltage converters: h Voltage Power Supply Module 250V 6.3V DC Converter NIXIE&Magic Eye Tube HV | eBaHigy
You have to use two separate transformer windings, because you don't want a common (negative) ground.
Use a bridge rectifier and a smoothing capacitor on both transformer windings.
Connect the rectified and smoothed voltage to each input of the voltage converters.
Adjust the output of one voltage converter to 210 Volts.
The negative side of the 210 Volts output is the common 'ground', the positive 210 V output is the + anode voltage.
From the other (6,3 Volts converter), connect the positive output side to the negative output of the 210 V. converter (=ground)
The negative output side of the 6,3 V. converter is now the (negative) 6,3 filament voltage.
I have used this setup in a power supply for a tube microphone and it works great.
- Two of these voltage converters: High Voltage Power Supply Module 250V 6.3V DC Converter NIXIE&Magic Eye Tube HV | eBay
I think I looked this up in the past. The type numbers are very difficult to read.What chips are those using? 34063 possibly, and..?
On the small PCBs I referred to the output is not isolated. (No transformer.) So if you want a negative filament voltage, needed for a U67, you have to use separate transformer windings.Usually they are SMPS and the DC output ground is isolated from everything.
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