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Old 7th July 2004, 06:41 PM   #31
moamps is offline moamps  Croatia
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Quote:
Originally posted by tiroth
This is tough to find. Moamps might be able to respond with the cap he used. I ended up using Mouser 75-MKT1826410064 but the leads had to be bent. You could probably use 23PW310 (10nF!) but I have not tested this.
Hi,
I tested my opamp with 47nF, 100 and 220nF MKT (whichever I happen to have at hand ), without a problem. This cap's value may range from 10nF to 1uF and the cap type does not really matter much (small elco, for example).

Regards
Milan

Edit: Mouser 140-PM2A333K 33nF with 3.5mm pitch looks good and cheap.
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Old 7th July 2004, 07:09 PM   #32
jhead is offline jhead  United States
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I would be interested in some of the caps from jen's to fill two Mox pcb's also if the group parts buy take's place would have a interest
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Old 9th July 2004, 03:18 PM   #33
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When I go to Mouser and type in the resistor part numbers, it comes up at .12 single and .10 @ 100. How does one obtain the .03 price as listed on the parts list? Thanks.
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Old 9th July 2004, 04:09 PM   #34
tiroth is offline tiroth  United States
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I spot checked a few part numbers and they all came up for $0.03. Are you sure you aren't choosing the 50ppm parts? Mouser sometimes "corrects" your part numbers unexpectedly...
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Old 9th July 2004, 04:28 PM   #35
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Yep, mine are coming up .03 now. It's mysterious. Thanks!
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Old 9th July 2004, 08:52 PM   #36
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Another possibly stupid thing...
for a bandpass filter, do you simply set a lower high pass and a higher low pass, and connect them together?
for instance, a 500 hz high pass and an 8000 hz low pass
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Old 10th July 2004, 02:01 AM   #37
tiroth is offline tiroth  United States
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Quote:
for instance, a 500 hz high pass and an 8000 hz low pass
Yep.
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Old 10th July 2004, 03:12 AM   #38
BDP is offline BDP  United States
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Stuffed and tested my first high and low pass sections with IC opamps and all tested great. Received the rest of the parts for the discrete opamps. They will be the next to be assembled and tested. I plan on building a few variations with bipolar and mosfet outputs along with a Borbely balanced circuit for the outputs.

BDP
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Old 10th July 2004, 06:53 AM   #39
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marsupialx

I hate to toot my own horn, but maybe you could benefit from reading the manual about my Active filter One project.

It can be found here: Webpage for Active Filter One

\Jens
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Old 10th July 2004, 09:41 AM   #40
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Default Discrete opamp question

Hello,
I have a question about C2 and C3 in the discrete opamp PCB: C2 is 100pF and C3 100nF.. why the former has a pin spacing that is double the latter? It is pretty hard to find 100 nF film caps with 2,5 mm spacing... or a ceramic is just fine?

Cheers

Andrea
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