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The Singing Bush Kits

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#33
Okay Choky,

The Serbia to Arizona trip is complete 😀 Thank you, it looks like I have some soldering to do.

Did you run any sims for my 4 ohm loudspeaker? Or is this kit you sent me for the load you used?

Cheers,

Greg
 
#34
Hey Greg,

From earlier in the year, ZM's suggestion:

The Singing Bush

Easy to do. All you need is a USB sound card, software and a few things such as cable, 4R load on heat sink, voltage divider so you don't fry your sound card. Turning the pot adjusts the Vds.

In my THF version I played with Vds and Iq, but I also raised the H2 by taking the speaker out at the half way point of the 0.6R between the current source and THF. It raised the overall THD a bit but I am happy with it.

Out of curiosity, I ran some sims with 2SK180 and 4R load, but the results did not correlate with ZM's real life measurements. So your best bet is to build it and then test and adjust.

Ben
 
#35
Man with Hair like that does not measurements

Measurements are done for a Man with Hair like that.

🙂

GG, just make it as per schematic and enjoy ; when bored , you can play with THD

give it big honkin speaks and THD will be at bay, while having zillion big headroom
 
#38
Celebrate my little daughter officially becoming a primary school student (because of the constant twists and turns during this period, now finally school)
And my shop (Taiwan site) opened

From September to October, all friends who place an order can get free shipping. I will pay for the shipping.

2SK1058 2SJ162 2SK1530 2SJ201 THF-51 2SK182ES 2SK180 LM350K 2N5566 MJ21193 MJ21194 MJ21196 MJ21195 MJ11015 MJ11016 NOS Jinfeng Triode
 
#40
Hi, I can find TOKIN THF-51S and I am willing to use that model, but I am not clear what extra I need to build the amp, sorry I only have built an amp 25 years ago, I am a bit of a noob. I think I need two IXFN140N20P, 'big output electrolytic' which I am not sure I know voltage and farads. The the power supply, I see +60, I think is the standard power supply used by Nelson Pass derived designs? Where can I find the power supply or schematics (I could build my own). I also saw that there is a version using chokes, which I find very interesting, I saw some pictures in the main thread. Is there a schema on how to wire a choked version? I see the tip and tricks thread has a schema but I have not found one (yet) on the choked version.
 
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