Green Ringer |
Once there was a friendly comparison of green ringer layouts on Aron’s forum and I laid out a smaller version than this one. Coming back to it recently, I decided to add some space and show off the symmetry of this circuit. tonepad.com is the source of the schematic.
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chris said:
Hi!
I’ve read that one should make sure the transistors are matched in the Green Ringer. Is this really necessary and if so, how does one go about matching transistors?
Posted 13.11.2007 at 7:06 pm
gaussmarkov said:
Hi chris!
I don’t think the transistors are the key thing. The place you need symmetry is with R6 and R7, with C2 and C3, R8 and R9, diodes D1 and D2, and R11 and R10.
If you are using 1% (metal film) resistors, then you can check them with a DMM but any pair you choose will probably be very close. With the capacitors there is much more variation, so definitely use a DMM to match those.
I’m a little shaky on diodes, so I’d check those with a DMM also. My guess is that most pairs will come out similar there too. But I would check.
There’s a lot of discussion of this sort of thing on Aron’s forum. I highly recommend checking there. Use the search function and type in “green ringer matched.”
You have to register to get access to the search function. But that’s easy and no cost. It’s all benefit.
Posted 13.11.2007 at 9:27 pm
chris said:
GM,
Thanks for your time and advice!
Posted 14.11.2007 at 5:04 am