Post your Solid State pics here.

[gerhard]

Quickly built over the holiday season from things that happened
to be here:

600 pV/sqrt(Hz) noise density, flicker corner in the very low Hz.
1 MHz flat bandwidth @ 60 dB gain
300 KHz flat bandwidth @ 80 dB gain
Lower frequency corner is DC if offset servo is defeated, <1 Hz otherwise.
It's fun if your scope shows 200 nV/div, but that makes sense only
with an external lowpass because of noise bandwidth.

Circuit is built on Vero powerplane board. This has a ground plane
between the predrilled plated-tru pads.
Just scratch away the lacquer and apply a little more tin
to have a near perfect ground connection.

regards, Gerhard

[Bonsai]

What is that thing? A phono amp?

[gerhard]

Originally posted by Bonsai
What is that thing? A phono amp?

two of these amplifiers could be used as a moving coil preamp
(probably with reduced gain ), but I'll use it in front of the
FFT analyzer to measure noise in voltage references
or phase noise in oscillators.

[gerhard]

.. and closed.
Fastening the 20 screws for top & bottom
feels like assembling a cylinder head.

[stinius]

Originally posted by gerhard
Quickly built over the holiday season from things that happened
to be here:

600 pV/sqrt(Hz) noise density, flicker corner in the very low Hz.
1 MHz flat bandwidth @ 60 dB gain
300 KHz flat bandwidth @ 80 dB gain
Lower frequency corner is DC if offset servo is defeated, <1 Hz otherwise.
It's fun if your scope shows 200 nV/div, but that makes sense only
with an external lowpass because of noise bandwidth.

Circuit is built on Vero powerplane board. This has a ground plane
between the predrilled plated-tru pads.
Just scratch away the lacquer and apply a little more tin
to have a near perfect ground connection.

regards, Gerhard

Very nice.

It seem like you have some knowledge in vhf and uhf design.

Stinius

[stinius]

Originally posted by stinius


Very nice.

It seem like you have some knowledge in vhf and uhf design.

Stinius

Correction, it seem that you know a lot about HF engineering as well as LF.
Very nice pictures

Regards

Stinius

[fritz39]

Bonsai,

Nice job on the preamp! Is the blue finned part shown in
post #656 a bridge rectifier? Who makes it?

Thanks.

[Bonsai]

Hello fritz39.

The blue finned thing on the right is the Amveco transformer - you can get it from digi-key.

[Bonsai]

Thanks for the compliment by the way!

[jalejos]

Continuing with our projects.
20 years ago I built a replica of the Quad 405 amplifier.
Overview.