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  • pe1pwf's Avatar
    10-18-2020, 08:59 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Hi Ivano, Are you still reading this tread? I guess so. I have been playing around with your schematic, it actually looks like something I tried before. And I mean the active filtering in te second opamp stage. I...
    656 replies | 63555 view(s)
  • pe1pwf's Avatar
    09-21-2020, 07:00 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    I discovered this issue Cor described when I wanted to have some recordings comparing the FG element I recently bought and the SPU element that I have been using up to this point. Some times the recording seemed to...
    656 replies | 63555 view(s)
  • pe1pwf's Avatar
    09-13-2020, 06:44 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Two nights ago I tried an FG element in my detector and found is was much weaker than the SPU element, maybe almost like 20 dB lower in my test recording. So I changed some parts in the amplifier and took out the small...
    656 replies | 63555 view(s)
  • pe1pwf's Avatar
    09-11-2020, 08:15 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Hi Ivano. I did not read through the LDO datasheet but usually capacitors on the output side of the LDO are larger. Are you sure 100nF is sufficient? Why the 2v5 regulator and not a voltage divider? Is voltage...
    656 replies | 63555 view(s)
  • pe1pwf's Avatar
    09-10-2020, 04:51 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    It is easy to fry your parts with hot air if you are not used solder like that. I always soldered SMD with my old Weller magnastat that I always used with standard(B7?) tip. People think that is huge and showed me their...
    656 replies | 63555 view(s)
  • pe1pwf's Avatar
    09-09-2020, 08:35 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Hi Ivano, thank you for letting us know you are working on this. I had no idea it would make much difference to use the inverting or non inverting input of the amplifier. I guess I skipped that part of the datasheet. I...
    656 replies | 63555 view(s)
  • pe1pwf's Avatar
    09-02-2020, 09:19 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Did anyone already capture a horseshoe? I do not have them around here so I played some recording. I you have a good recording of rhinolophus hipposideros (lesser horseshoe) I'd like a copy. This is an image of...
    656 replies | 63555 view(s)
  • pe1pwf's Avatar
    08-27-2020, 06:17 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    What is that with the display Cor? It looks much different compared to the v1.0 software... Well I know of course, and in case you guys did not notice how good the serotine looked in Cor's last message, I...
    656 replies | 63555 view(s)
  • pe1pwf's Avatar
    08-24-2020, 03:08 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    It would be nice if something as simply as an oriental frying pan or lid could work, unfortunately the higher te pitch the shorter the wavelength and the lager the chance that the sounds are reflected are not in phase....
    656 replies | 63555 view(s)
  • pe1pwf's Avatar
    08-22-2020, 12:33 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    I guess you should be able to hear discharge sounds, MFJ is selling the 5008 as device to detect ultrasonic discharge sounds with a parabolic dish. MFJ is normally producing HAM radio equipment, apparently they use...
    656 replies | 63555 view(s)
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About pe1pwf

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About pe1pwf
Location:
Netherlands
Interests:
Ham radio / electronics
Occupation:
Mechanical and electrical service tecnician

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