Ready to use PCBs for op-amps.

[beppe61]

Dear Gentlemen,

I would like to buy some ready-to-use PCBs to experiment with some op-amps, single and dual.
In particular the single op-amp I intend to experiment with is the AD797 that I esteem a lot.
I would be extremely grateful if anyone could direct me to any web-site or DIYaudio inmate that makes them.

Thank you very much to anyone.
Kind regards,

beppe

[Wynand]

Why don't you try veroboard / strip board

[beppe61]

Originally posted by Wynand
Why don't you try veroboard / strip board

Thank you very much for your kind reply Sir.
I should have added that I have never made a pcb by myself.
I bought some of low quality (narrow power supply traces, not very good indeed) in the past.
Could you show any link for instructions on how to use this veroboard?
I would like to get a robust and reliable pcb anyway.

Kind regards,

beppe

[pinkmouse]

The kind of PCB you need depends on the application you are using the chip for.

[Nordic]

if you never intend to do another project again, go ahead and order a premade board...

I can make a pcb for a headphone amp, with a black marker, ferric chloride, and some small scraps of blank pcb in under 30 minutes by now, and it probably works out to less than a dollar...

Out of all the cheap and nasty methods I tried this is still the easiest and fastest and cheapest for me.

Its real simple, design pcb in eagle, print to paper, cut out paper and celotape to pcb, drill holes, remove paper, and connect the dots with the marker, according to the printout.... chuck it (the pcb, not the paper) in the ferric chloride for 5 minutes, and your done...traces thicker than needed are not always a good thing as they easily act as antennas... I comfortably run gainclones sapping 5A peaks on veroboard/stripboard... I find the regular stripboard impracticle for small 8 pin opamps.... matrix board might be better, but I can never get the same mechanical quality out of the project. You get small project stripboards that have groupings of traces, (you'll see many pictures on the head-fi forum, google it ), which are very nice for opamps though.

[beppe61]

Originally posted by pinkmouse
The kind of PCB you need depends on the application you are using the chip for.

Dear Mr Pinkmouse,
actually I already have a pair of AD797 op-amp that I intend to use as unity gain buffer.
I already use a pcb from an italian brand of kit but its quality is very poor (small traces, no space for caps around the OAs).
All in all I did not like it.
The regulation would be out of the pcb.
I already have a low noise +/- 15V dual supply at hand.
Maybe some place on the pcb for some buffer capacitors.
I like the idea to have some capacitance ( let's say 4x4700uF) very close to the OAs.
I read that class AB OAs need very low impedance path for current supply as hey drawn current in a variable way depending on the musical contents.
It would be better for me to buy within EU.
By the way PCBs for other purposes can be adapted.

Thank you so much.
Kind regards,

beppe

[beppe61]

Originally posted by Nordic
if you never intend to do another project again, go ahead and order a premade board...
You get small project stripboards that have groupings of traces, (you'll see many pictures on the head-fi forum, google it ), which are very nice for opamps though.

Thank you Mr Nordic,
I will look through the site you mention.
I think that a PCB for a DIP op-amp based headphone amp should be perfect.

Kind regards,
beppe

[richie00boy]

4700uF is many times bigger than any bunch of op-amps will ever need, too big actually for decoupling which is what the close caps are intended for.

Maybe you could also try a 'breadboard' where you plug components in, hence can re-use them. They are standard issue for young electronics students.

[beppe61]

Originally posted by richie00boy

4700uF is many times ....

Thank you for your very valuable help.

4700uF is many times bigger than any bunch of op-amps will ever need, too big actually for decoupling which is what the close caps are intended for.

Ok I have exaggerated. Let's say the half.
I just want to be sure that near the op-amps there is a sort of power reservoirs for music peaks.
Of course also other space for smaller film caps.

Maybe you could also try a 'breadboard' where you plug components in, hence can re-use them.
They are standard issue for young electronics students

The fact is that I envy those very fine pcbs that often appear in this pages.
I have even thought about take out from an old cd player the output stages pcb and try to use it.
For instance I have a Rotel that could be just perfect but it is still working.
Nevertheless its pcb would fit my needs just perfectly.
The spare part is not available, unfortunately.
It would be perfect.

Thank you very much indeed.
Kind regards,

beppe

[mitwrong]

Hi,

A 4700uf cap is sufficient or not for op-amp????

Sometimes is ok and sometimes not. why! due to the sensitivity of the op-amp, the ripple will affect the working condition of the op-amp. The best way is to use regulator or active filter, ( a cap connected to the base of a transistor ). This two method provide better DC than capacitor filtering. ( even you use 10k uf ).

To employ regulator or active filter is the best choice than use large capacitance, due to capacitor can't remove ripple, only suppressing. You can try and see the differences.





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