Post your Solid State pics here

[VeGaATS]

Thanks again.
Yes, the relays are latching. Voltage regulators are LM317 for both plus and minus… for some reason the 317 are quieter than the 337s. This is the circuit I designed for this preamp.
VG

 

[VeGaATS]

2S2A Power Amp

Before finishing the PreAMP, I built this power amp.
VG

 

[von Ah]

VeGaATS, your builds are absolutely stunning! Fantastic work. Tell us more about the power amp.

 

[VeGaATS]

Thanks, von Ah!

I will, but to power the PreAMP, the 2S2A2 amp, two subwoofers and other stuff I also built this remote-controlled power strip.

VG

 

[VeGaATS]

About the 2S2A2 amp…

Again, I do this because I want something better.
This circuit is the result of a few years of research.
Before this amp, I designed and built a good number of other circuits, class A, AB, and a few years back I played some D class off the shelf circuits, mainly the TI variety. I learnt a lot.
I designed this circuit with the OPA445 high voltage opamp at front end. This is the basic circuit. It is designed to work on 2 Ohm loads.

VG

 

[bonjonno]

Mind blown! Something to aspire to in a future life. Way to go VG.

 

[mdardeniz]

VeGaATS very very clean works. Congratulations!



How do you leave your table that much clean

 

[VeGaATS]

Thanks, bonjonno and mdardeniz!

I keep my bench clean because it helps me think… and is not as clean as I would like.
The power amp and the preamp shown here will be used in place of an Onkyo M5000R / Onkyo A-9070 combination that I used until recently. The power amp is very accurate and balanced. By comparison, the M5000R sounds fuzzy.

VG

 

[fredbloggstwo]

Hi VeGATS,

A very well thought out and constructed project - and a pointer to what looks like a very useful magazine - Nuts and Volts. (Damn, another subscription )

I would like to experiment with some remote control 'stuff' and have a question for you. The chip you used to accept the remote control commands, is that a PIC or an off the shelf chip. I can't quite read the ident on the circuit diagram.

Regards

Mike

 

[VeGaATS]

Thanks, Mike!
You do not have to get a subscription to Nuts and Volts… if you google “Speaker protection with optical coupler” you’ll find the info you need.
That is the good old PIC16F87, the L version in my preamp.
VG

 

[fredbloggstwo]

Hi again,

so for your pre-amp, you programmed the PIC to receive and decode the commands from the remote control - did I get that right.

Thanks for you patience.

Mike

 

[diyralf]

Before finishing the PreAMP, I built this power amp.
VG

You are very talented in housing and electronics design!

 

[WalterW]

My first version of this legendary preamp came to life today.
Still have to perform some bias tweaking of the input Jfet's and output Mosfets. (2SK389BL/2SJ109BL and 2SK2013 + 2SJ313)

Compared with my PS audio preamp and my Calvin buffers, I have a very very good feeling about of this one. I'm only listening mono sofar and will not build a stereo version of this one, that will be for the final design and PCB's.
The heatsinks on the regulator PCB are to small, temp is 50°C above ambient!

Hi Bensen, is it possible to share schematics of the Blowtorch?

 

[andrewlebon]

TD CLASS

Finally the pcbs have arrivedslow progress

 

[thimios]

It looks very interesting!
Waiting for your test

 

[VeGaATS]

Mike,

Yes, the PIC microcontroller is programmed to learn the codes from the remote... and you are welcome.

VG

 

[VeGaATS]

Diyralf,

Thanks! ... it is all about passion, experience, learning from mistakes, perseverance and a wife who understands all this.

VG

 

[VeGaATS]

andrewlebon,

Your boards look very interesting... what are they for?

Best,

VG

 

[ostripper]

Finally the pcbs have arrivedslow progress

Wow ! A homegrown digital tracking amp like a Lab Gruppen.

OS

 

[ostripper]

About the 2S2A2 amp…

Again, I do this because I want something better.
This circuit is the result of a few years of research.
Before this amp, I designed and built a good number of other circuits, class A, AB, and a few years back I played some D class off the shelf circuits, mainly the TI variety. I learnt a lot.
I designed this circuit with the OPA445 high voltage opamp at front end. This is the basic circuit. It is designed to work on 2 Ohm loads.

VG

I tried that type design for my "eyesee" IPS. Very problematic in selecting just
the right OP-amp , compensation.
Then I found the inspiration for the "shunt/CFA" version.

I was even surprised with (2 people built it) of the fast CFA squarewaves
and stabilty , even with "junky" old op-amps.
Some ran this (below -with 80V rails). New version will have 12V pass regs.
This one might be coming to the store.

OS