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PerN vor 1 Stunde
I can not find any "download original" link. I also tried to go to full screen. Is there anyone who can give a more detailed description on how to download the schematics? Thank you!
Navtex receiver
Denis  Holliday
Denis Holliday vor 9 Stunden
The Naim Uniti has an option to select a high pass filter before the power amplifier, set at 100Hz, to limit low frequencies to "small" loudspeakers. A Sub bass unit is then used to provide the deep bass. It works very well allowing the "small" loudspeakers to do what they do best. Could such an option be considered for this unit ?
Active audio crossover filter
ThijsBeckers vor 10 Stunden
Did you follow the construction manual and tested it BEFORE you put it together? Disassembling the PCB housing is almost impossible, that's why it says in the manual to test it before assembling it fully. Or did you test it, found it working, assembled it and then found it doesn't work anymore? There may be a short somewhere, for example between PCB 3 and 4 where they meet PCB 6 (where the output signal is routed to K2). Those corners are hard to see and get proper light into to see what you're doing. I remember having a short there once. The key here is not to use too much solder! I find the assembly of the PCB-case the hardest part. Not so much the SMD part. I believe we did our best to describe all aspects as good as possible, but we're open to suggestions. I didn't get what you mean by "the IC-case is not a good idea". Can you elaborate? If you meant "PCB case", then I would argue that it's a really good AND economical solution. It's very cheap if you compare the cost of the extra PCB area vs. a standard housing. Also, it's completely covered with ground plane, so the sensitive circuits is optimally shielded. And it is quite sturdy. I don't see what would make a traditional case the better choice for this circuit (apart from maybe less hassle when soldering; but it would also add to the price). To be honest, we've sold 2000+ kits of the Tapir. It's been a very popular product. And there is very little negative feedback, as you can see (your the first one here; we've received some complaints via email which we were able to solve satisfactory)... So let us know how we can help.
Tapir - Ultrasensitive wideband magnetic/electromagnetic field detector
merlinb vor 10 Stunden
P4 is a trimmer to allow adjustment of the zero-crossing trigger point when the gate moves from 'off' to 'on'.  P2 allows you to tune the length of the 'on' time, so you can therefore set it to give a clean zero cross point when the gate moves from 'on' to 'off'. Does that answer your question?
Analog Audio Burst Generator
jawi vor 21 Stunden
I have looked at which available ICs are interesting to try:MC33079PLT1361 / LT1362 (expensive)and with reduced supply voltage:MCP6294 (Vcc <6V)they are all opamps with an Input Noise Voltage Density of less than 10 nV/√Hz  
Active audio crossover filter