Three-pole compensated blameless clone

[jjs]

We plan on moving D9 on the Wolverine to the collector on the next pcb order. This was recently found.

Jeremy

 

[jjs]

"Does the diode position (emitter vs collector) mean a lot ?"

See post#2
https://www.diyaudio.com/community/...pensated-blameless-clone.397740/#post-7312926

 

[LKA]

I made a measurement amplifier to extend the voltage drive capability of the Viktor oscillator. Yes, it uses triple pole compensation.

 

[LKA]

The noise measurement gives the exact number from the simulation. The input is shorted via 50R to the ground.
(measured by cosmos adc)

 

[LKA]

THD1k measurements.
The chain was : Viktor1k -> MAmp -> low impedance voltage divider -> passive notch filter -> post notch amp +40dB -> modded X-Fi USB HD

 

[LKA]

The amp itself is a front-end module which I use for my K200/K300 HEC power buffer.
The power supply components are leftovers from my past projects.

 

[LKA]

Guys, are these measurements ok ?
sine 1k,10,20k clipping into 4R
sqr10k 40Vpp into 4R

 

[jjs]

Those look great!

Jeremy

 

[LKA]

I'm still just at the beginning of tuning.
The first THD measurements give quite good numbers.
THD1k 10Vrms,20Vrms without load 0.00001%, into 4R 0.00006%
Three-pole compensation works, I tried TMC and TPC (jumper on pcb)

 

[LKA]

pcb v2 THD1k 20Vrms 8R (dBc, H1 is at 0dB, manual fundamental in rew)

 

[LKA]

The pcb v3 is in production

 

[pbilous]

Looks nice!

 

[LKA]

THX !

I should put it together asap and see the difference in measurement.

 

[pbilous]

I thought why not try the 3 pole compensated blameless amplifier clone. It worked out pretty well in simulation.
All important information is on the pictures.

What is happening in the 40-50 MHz range in OL graph? Is that normal?

 

[MarcelvdG]

Probably cancellation between the signal going through the compensation network and through the transistors.

 

[LKA]

The third version is assembled. The very first measurement showed excellent distortion performance, comparable to a "wolverine" amp. CCIF IMD 50W/4R 0.0002% (I think it was limited by my equipment)

 

[HRDSTL]

Laco good JOB!

 

[thimios]

Always clear and beautiful work !
Congratulations 👏
Wolverine is a reference! 😎

 

[LKA]

THDvF charts 1W,10W,50W/4R
The result is limited by my sound card.

 

[LKA]

The fourth version of the PCB is ready. Version 4.1 is on the way (I've been waiting for customs clearance for 20 days now) and will be sold to local diyers.
SSR3 is also part of the measurement - THD 1kHz 50W 4R . Classic output coil is not used, despite this, the amplifier is stable to capacitive load.