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[saber]

thanks Daver for help

can you tell us about this changes? (is ver3.1 have mistake?)

if you can tell us about all mistake, please show us on schematic

thanks again for your helps.

[Davor]

No. I was considering making it with some changes, but the number of changes happen to be too many and I decided to develop a completely new thing.
Anyway, I like this project. It has the best front end of all the VLF detectors around.

Supplying a detector from 16V adapter is a bad idea. You should try batteries instead. Anything connected to mains is a great source of noise.

[saber]

thanks Daver

i use 16v adapter for test but i have only noise on the speaker and q10 going hot

can you help me for this problem?

are you make this ver (smw3.1) ?

[Davor]

Yes, busy digesting
MPSA13 and 14 are basically the same thing for your purpose.

L7810cv is not a low dropout voltage regulator (LDO) and you should have at least 3V on top of the regulated voltage, in your case 13V or more. If it is not a problem - go for it.

[saber]

is any one there?

[saber]

hi

i build smw3.1 and i have no sound (just noise)

help me please

i use MPSA14 instead of MPSA13 and L7810cv instead of LM2937

please tell me what is those pins:

M
0V
AGND

and put a Front and back picture from your smw3.1

[Davor]

Yes. You might experience instability at the end of battery life. LDOs are much more expensive, yet they give you more comfort in use.

[saber]

can i use ka7809 Instead ic7: lm2937et-10 ?

i can't find uA7810 in our City!!!

[Thomas]

yes, that is about the same as uA7810, but you will have to keep batt voltage above 12V

this would be good if you can get it http://www.ti.com/product/tl750m10

[saber]

UA7810 would be one, it has a 2v dropout so not much of a LDO reg. can you do SMD?

yes. i can do smd

you Mean L7810CV. ?

[Thomas]

UA7810 would be one, it has a 2v dropout so not much of a LDO reg. can you do SMD?

[saber]

The LM2937 is a 10V Low Dropout Regulator, so it would be best to replace with with a Low Dropout Regulator @ 10V.

Can you tell me some of them?

thank you

[walkman]

HI Walkman

the smw3.1 it's work it's correct

thank you

best time

Hi
I can't test it. I don't know

[Thomas]

The LM2937 is a 10V Low Dropout Regulator, so it would be best to replace with with a Low Dropout Regulator @ 10V.

[pigeon]

HI Walkman

the smw3.1 it's work it's correct

thank you

best time