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Tuesday, June 21, 2022

Hello 6502 world!

I've worked with computers for about 40 years. In the late 70's when I was in Tech school we learned how to write programs first on chalkboard then on paper coding forms. We submitted our programs on coding forms that were sent off-site and we would receive our results a few days later.

We also learned about truth tables, AND, OR, NOT, NAND, and NOR gates. In one of our labs we actually built an adder. We had to pool our breadboards together so we had enough space to build the circuits. We eventually got it to work.

I have a lot of fun playing with Arduino microcontrollers and Raspberry Pi microcomputers, but I've never built a functional computer from the bear-bones chip up. This changed after I discovered a YouTube channel run by a guy named Ben Eater.

His whole channel is devoted to building a computer from the wires up. After finishing his big project he is following up with a simpler project where he builds a computer from the chips up. I bought a 6502 kit from him and have been following along with the project.

Ben Eater's YouTube channel.

Monday, March 28, 2022

How to add a Zoom Q2n-4k to OBS as a Web Cam

I'm using a Mac but it should be the same on Windows.

Connect the Q2n-4K to the computer via the USB port and turn the Zoom on. The camera will usually detect that it's connected via USB to a computer and present you with the option to use it as a card reader, webcam (default), or a USB microphone. Select the center Webcam option and press the red button for OK. It will then ask you if you want to start the webcam - press the red button again.

I usually create a separate scene for the zoom webcam but that's not necessary, the webcam can be added to an existing scene. Create or select the Scene you want to add the webcam to.

In Sources click the plus sign and select Video Capture Device and give the new device a name (I use Q2n4k Video) and click OK.

On the Video Capture Device screen select "Q2n-4k Web Cam" in the Device dropdown box. Select the highest resolution available in the Preset dialog box. When used as a webcam the Q2n-4k maximum output is limited to 720. Click OK.
Video input devices and audio input devices must be added seperatley in OBS. Use the same scene from above and click the plus sign in the sources section. Select Audio Input Capture and give the new device a name (I use Q2n4k Audio) and click OK. On the Audio Input Capture screen select "Q2n-4k Web Cam" in the device dropdown box and click OK.

When using the Q2n-4K webcam you must have Auto Gain set to Concert, Solo, or Meeting. If Auto Gain is set to off then you must adjust the audio levels manually with the dial on the right side. You will also need to monitor the webcam audio in the Audio Mixer panel in OBS.

Saturday, January 08, 2022

Ham Radio Television

A tour and demo of my ham radio television station (Amateur Radio Fast Scan TV.)

The transmitter is an HV-320 produced by HiDes. It puts out about 1 watt of power. The receiver is an HV-122 also made by HiDes. The HiDes transmitter and receiver send and receive using DVB-T The power amplifier is a 23cm, 30/15/4.5 Watt, 49 dB Amplifier Model 23-11A by KH6HTV.COM.

While testing at home I'm transmitting and receiving on 1.243Ghz, but the HV-320 and HV-122 can transmit and receive on any Amateur Radio band between 100Mhz and 2.5Ghz. There is additional information about Amateur Radio Television at kh6htv.com/application-notes.

Friday, October 15, 2021

Now I know!

Now I know why I keep coming home with the wrong type of light bulb. I only now learned that I need to look for "A19" printed somewhere on the box. The "A" specifies the standard pear shape and the "19" specifies the maximum diameter given in 1/8 of an inch (USA only - millimeters everywhere else.) An A19 bulb is a standard pear shape and is 2 3/8" in diameter. A G25 bulb is a 3 1/8" diameter globe shaped decorative bulb. This is the kind of stuff they don't teach in school (at least not where I come from.) Now I know!

Wednesday, October 13, 2021

Copper cutout

Copper pronghorn antelope cut out with jewelry saw. It took me a half an hour and 2 blades. Had some difficulty with the horns and a couple of the hooves, but overall it went well. Pleased with first attempt. 20 gauge and 3/0 blades.