Working on my mouser order for the parts that I don't have in anticipation of the PCB arrival soon 🙂
Absoltuely, I am waiting for the boards to see the size of the fuse clip that I need. Do you mind to share the info?
Thanks,
Inverted J-FET Circlophone PCB's
Because not all the PCB-orderlist subscribers claimed their boards, I have a few spare boards available for those who are still interested.
First come, first served until the stock is exhausted.
@Userguide: thanks for your confirmation!
Have fun building!
Because not all the PCB-orderlist subscribers claimed their boards, I have a few spare boards available for those who are still interested.
First come, first served until the stock is exhausted.
@Userguide: thanks for your confirmation!
Have fun building!
That's a 250VA 25v rated Avel Lindbergh toroid which produces +/-37v using the Dx PSU with qnty 4 x 4700uF 50v Nichicon caps.
An externally hosted image should be here but it was not working when we last tested it.
Here is closeup of PSU - it's very simple and works quite well.
What value are the inductors (L1/L2)?
Edit: Are they 10uH?
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Yes, you can read the part numbers. Technically the plan called for 1mm magnet wire wrapped 18 turns I think.
'warm AB ' that interesting, i have always thought AB bias currents could be higher for sound improvement.
Does anyone know if the Teddy PowerReg would be a good idea for powering the Circlophone?
I was going to use them to power a chip amp but got persuaded to build the Circlophone instead.
I was going to use them to power a chip amp but got persuaded to build the Circlophone instead.
Like most "normal" amplifiers, the Circlophone does not require a regulated supply..
In the best case scenario, if the regulator is truly excellent, it will change nothing.
If the regulator has shortcomings, like a funny output impedance under certain transient conditions, it may cause a degradation.
Thus, adding a regulator adds complexity, cost, increases the risk of problems and reduces the OP power (the regulator eats up some supply voltage) without bringing anything positive.
A good standard supply with a large reservoir capacitor directly on the Circlophone's supplies is all that is required.
You can play with CLC or CRC too, but the last C has to be large, >2200µF, preferably 4700µF
I am using a 250VA 25v transformer from Avel Lindbergh. With 125vac mains I get 35vdc rails with four 4700uF caps. I am using then Dx PSU shown above. This supply seems to be perfectly suited for the Circlophone.