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I found myself in a situation where I had to power an 8V relay from 6.3VACrms, and I had to delay the enabling of the relay by 10-20s. Basically I needed the HV of the tubes to be delayed until all heaters have had time to warm up. So when you don't have enough voltage, and you need to drive a relatively small load, you can build a voltage doubler, by replacing the second arm of a diode bridge with capacitors. The relay enables after 15s in my case (the capacitor being 1mF), which is more than enough time for the heaters to warm up and the emission to begin. This is an exact replica of the circuit I made and you may wonder why it's a balanced power supply, this is because I use the humdinger method I discussed in another circuit to power the valves which requires a balanced supply. So far it seems to be working well, I just made it last night and haven't had the time to test It out, but I think it should work just fine.
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