It would be a good idea to use a 240-220V transformer as the transformer supplies the motors and some other stuff with unrectified 220V AC. The transformer also supplies the voltage doubler with the BY104 diodes and 16uF capacitors so you need to check so that those are ok and that they will work with a higher voltage if you don't use a 240-220V transformer. It looks like the ER33 is connected with anode on top, cathode at the bottom, the priming electrode is connected to the 10M resistor and then you have one trigger electrode to the left and one to the right. The circuit with the ER33 seems to be driving a relay (the rectangular box lying down with 10K written inside) means that you might not be able to use any of the similar trigger tubes as they will have a lower anode current which will either not drive the relay or wear the tube out prematurely. You can calculate the current from the resistance values in the circuit and the voltage drop across the ER33 and compare that with other similar trigger tubes. You'll also have to take into account the trigger voltages if you replace it with anything else. The ER33 seems to be connected in a way that it is ignited at power on, from the trigger electrode to the right as that electrode is only connected via a voltage divider and a capacitor that gets its power on pulse from the 300V line. So I guess the ER33 is for resetting at startup and then for resetting at every cycle in the circuit. It looks like your best choice is to find the Z660W or the Z661W and either connect the trigger electrodes together for the ER32 or use them separately for the ER33. /Martin
On Saturday, June 22, 2013 12:06:07 PM UTC+2, bob harper wrote: > hi all, have now got the schematic, for you experts to look over! also as > the power supply is missing, it looks like its a just a isolation > transformer at 220v is it worth going for a 240>220? also the original > design used a pair of OA2 regulaters, solid state be better and easier? > unfortunately the DC voltage is not shown....i have attached the 2 > photo's....cheers, bob -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/47ffa960-7a9e-4d49-92ff-e6048c4199f2%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
