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It's shown in the photo above so you know the sort of part to try. Try a few different values for the timebase and make a table. Not to knock the Arduino. Maybe the resistor needs to be adjusted to suit the transistor used?
the rear of the rotary switch as shown.
C10 decouples the feed. I did, however, do my early testing on a KL25Z, so if you have one, you can still work through the code, although standalone operation wont be possible. An LPC1114 racing will fit in a breadboard and is very cheap if you already have a USB to serial adapter. This is generally fairly obvious, as the radio's tuning control will have little effect. So I decided to hack a scope probe, to build a signal generator cable / probe.
There are also two libraries, four frequency bands would have been needed to cover the range. The mBed library and one for SD card access.
Fun With Signal Generators - ohio Signal generator - Wikipedia
I would support Gary's comments (as reproduced on the website). Theres quite a bit of discussion about this on the mBed from discussion boards, but ultimately it is ground difficult to get very short timers without a lot of jitter through the library. The only thing to remember is that if the exec loop changes, you need to recalibrate. To answer that, I added a temporary calibration mode and hooked the device up to a scope.
If you monitor the frequency of the generator with a frequency counter, then you will be quickly able to wind a set of coils which work for you. The output is on pin 11 of J4 (marked as DAC0_OUT on the pin out picture that comes with the board). The only problem is the board doesnt have 16 pins all on one port easily accessible. Countscounts; / convert to count up counts110; / how many ticks before we proceed (40nS per overhead) do clockPIT- AL; while nop nop nop nop / fine tune delay In the end, I didnt really like this approach. Alternatively, you may be able to use the scale and pointer arrangement from a scrap set. For the devices purpose, this timing scheme is perfectly adequate.
Note that isis Lite and ares Lite are unlimited shareware products. I took about an hour to wind perhaps six or seven coils to determine an optimum set of three coils. It is also simpler to implement and gives consistent results - important requirements for this sort of project. Alternative Calibration If none of these items are available, you should be able to adjust part of the range with a normal broadcast radio, as described above. I have made some minor tweaks in the attenuator department to give me the ranges shown and to "peak" the response at the top end (as the level does otherwise fall several dBs up at 30MHz).
DIY Simple Signal Generator
Its not a precision generator, but it is become excellent for the intended purpose and considering the cost! C1C2 is a Jackson Type-O air spaced variable capacitor. The audio oscillator is quite particular about the types of capacitor used for C15, 16 and. They also dont do well below a certain time (on the KL25Z, that time was about 26 microseconds).