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DIYcrap audio mixer #3. FV-1 Reverb
This is part 3 of "building an audio mixer with effects". For part 1 go here, and for part 2, go here.The mixer is working fine, and already has got two PT2399 circuits for delay. But now it is time to...
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Receiving JT65 with RTL-SDR
A couple of weeks ago I bought a RTL-SDR (software defined radio receiver) dongle with the 820T2 tuner chip. You just cant beat the fun/price ratio on this one. For 11$ (with free shipping) it is a...
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Script for downloading all Popular Electronics magazines
The great page http://www.americanradiohistory.com/ has got loads and loads of old radio and electronics magaizines for download. Among these are venerable Popular Electronics magazine spanning from...
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10 Great Audio Books for Makers and Geeks
Disclaimer: The DIYcrap blog is meant to be exclusively about crap that I am making. This post is going to be one rare exception to that rule.I am a sucker for inspirational and geeky audio books....
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Pregnancy countdown device with Arduino
Once you or your spouse gets pregnant, thats all that matters in life. You immediately starts to count down to due date and you constantly want to know the current weight and length of the baby. And...
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Motion sensor to detect sneaking toddler
Once the kids are asleep at night, you can finally relax. Aahh. Maybe you want to stress down with a violent splatter movie with the volume at 11? In this situation you definitely do not want the kids...
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OpenPanTilt electronics
It has been a while since I made the OpenPanTilt prototype. It is now available on Thingiverse:655790 and I am quite surprised about the feedback and attention it has gotten. Billions of people have...
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Building a SoftRock Ensemble RXTX SDR
IntroductionThe last couple of months I have been listening a lot to the soldersmoke podcast. In case you do not know, it is two guys, Bill N2CQR and Pete N6QW babbling about building homebrew radios....
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Softrock RXTX completed
After finishing up the receiver part of my Softrock Ensemble RXTX SDR transceiver with great success, I got really motivated to get the transmitter going. The last weeks I have followed AB4UG's...
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WSJT-X and HDSDR with Softrock RXTX
Introduction - A Raspberry failureMy first (and, as it turns out, rather ambitious) plan was to use a Raspberry Pi 2 as SDR computer for my SoftRock, with Quisk, Fldigi and WSJT-X. The plan was to use...
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Upload log files to QRZ.com automatically using LogPusher
IntroductionMany radio amateurs upload their QSO logs to QRZ.com. Not all logging programs can interface with the QRZ API, and unless you are a subscriber, the API does not work. The log can be...
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Lowpass filter for 30m
I just finished a 30m lowpass filter for the Softrock Ensemble RXTX tranceiver.I used the schematic provided by WB5RVZL200 and L201 is wound to about 0.9uH, whereas C200 and C202 is 100pF and C201 is...
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Homebrew dummy load
I have created a simple 50 Ω dummy load to test transmitters. I also added a simple RF diode detector so I can measure the peak voltage, and calculate the power. The dummy load consists of eight 100 Ω...
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Directional coupler
IntroductionI have been struggling to understand how my simple dipole antenna works (or doesn't work). The diycrap way to understand stuff is usually to read, build and measure, and then read some...
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Nixie tube experimentation with IN-12
IntroductionI have always wanted to try out Nixie tubes in one of my projects, and here we go. Nixie tubes come in many different sizes and there are both top view and side view nixie tubes out there....
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Homebrew SWR and power meter
First of all, this SWR meter in this article is not exactly homebrew, as I based the circuit on the schematic in the excellent book Arduino Projects of Amateur Radio. Although I bought the book and...
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Building Farhans Minima Tranceiver Part #1
IntroductionI have started my most ambitious electronics project so far. After building my Softrock RXTX I was eager to learn more about RF designs, and HF radios in particular. I came across Farhan,...
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Minima #2 - Crystal filter construction
Making the crystal filter for the Minima Transceiver has been a challenging but very interesting experience. Challenging because I do not have any fancy test equipment. But I learned a lot, and it was...
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Synthicase and Softrock timelapse build video
I finally got around to throw my synths in a suitcase. It is a injection moulded case (Pelicase copy). The case consists of a x0xb0x bass synth, a Sonic Potions LXR drum machine, a Shruthi-1 synth, a...
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Loaded dipole for 20m
My HF-project has stalled since I do not have a decent antenna. I have limited space for a full-sized antenna on my roof. My friend LA8OKA has assembled a loaded 20m dipole, and I wanted to test a...
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