IMSAI Guy
#1270 GPS Patch Antenna (part 1 of 2)
updated
graphing the threshold voltage
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don't use 2N7002 or BS170 for level translation
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just a look inside
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make one today
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a look at the old remote
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It works and you too can get one:
pcbway.com/project/shareproject/Linear_Optocoupler_160f2e4f.html
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I layout a board:
pcbway.com/project/shareproject/Linear_Optocoupler_160f2e4f.html
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can you make the transfer curve of an optocoupler linear?
docs.broadcom.com/doc/HCNR200-HCNR201-High-Linearity-Analog-Optocouplers-DS
docs.broadcom.com/doc/AV00-0291EN
vishay.com/docs/83708/appnote50.pdf
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new brain for the robot
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sent into the channel for review
It might be a good fit for my robot
CrowPanel ESP32 display: elecrow.com/display/esp-hmi-display.html?idd=5
CrowPanel ESP32 4.3'' display: elecrow.com/esp32-display-4-3-inch-hmi-display-rgb-tft-lcd-touch-screen.html?idd=5
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Omnibot is moving with remote control
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I add motor control to the robot using off the shelf L298 modules and esp32
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OmniBot Controller Development
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I decided to use the ESP-NOW wireless interface.
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use old brains?
Crowbot: youtu.be/OgCZ1Togmt4?si=_OPINNJc1rqN01At
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0:00 Begin
1:22 the brains inside
3:10 MSM4611A 4 bit
5:33 ImsaiDog checks it out
5:50 recycle existing robot
crack it open and look inside
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time to renovate an old friend
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200 in 1 projects for the budding EE
zpag.net/Electroniques/Kit/200_manual.pdf
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sent into the channel for review
8 bands frequencies, including FM/AM (✈aviation band receiving). AM: 108-136MHz Rx; FM: 50-76MHz Rx, 76-108MHz Rx; VHF: 136-174MHz Tx/Rx, 174-350MHz Rx,350-400MHz Rx; UHF: 400-470MHz Tx/Rx, 470-600MHz Rx.
Buy: tidradio.com/products/h3-ham-radio
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a bought this just for fun
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use a microcontroller (ATTINY85) as a bit generator
LFSR Random Number Generator: youtu.be/WGhRAbQ1fRw?si=lyA2oGOHiSBSX1BA
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fix it. I'm giving it back to the store for someone to buy.
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was given to me by anchor electronics. It has bizzare problem
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double your pleasure, double your fun
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sold by Sparkfun, designed by mix-sig.com
code: github.com/imsaiguy/MSGEQ7
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The boards are back! Lets try it out
Buy: pcbway.com/project/shareproject/Dual_and_Quad_OpAmp_SImple_Tester_f0fc4495.html
SMD soldering: youtu.be/aoG15wpobF4?si=YZZvK-BkDMXXUV7q
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Simple dual and quad op-amp tester. A quick and easy project
Other people have circuits very very similar. I just wanted to do my own.
Buy: pcbway.com/project/shareproject/Dual_and_Quad_OpAmp_SImple_Tester_f0fc4495.html
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DG508 newer replacement
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scrap from million dollar donors. Reminds me of Logan's Run
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old die, new package
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video amplifier with filter
the 12dB gain was probably due to a non 50 ohm input/output
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low drop out, enable, supervisor, 1A, SMD
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sent into the channel for review
roxontool.com/products/flex
KS2 Review: youtu.be/olt-z-Da_k0?si=Fw8TifhxnC1M-2Fr
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0:00 Previous Model
1:37 Roxon Flex Review
the 555 survived: youtu.be/8QF_h43L9mg
how will the 74HC14 do?
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Repaired
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troubleshooting with reversed schematic
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A gift from anchor-electronics.com
Pacific Radionics Inc. 581 Division St., Campbell, Calif. history:
"Boole & Babbage, Inc., the systems evaluation firm also in Palo Alto, expects to broaden its measurements technology base with the acquisition of Pacific Radionics, of Campbell, which makes interfaces for process control. " -1970
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is more better?
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viewer request, schematic review
Manual: keysight.com/us/en/assets/9018-05613/service-manuals/9018-05613.pdf
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375MHz oscillator. the cap is called gimmic not mimic as I say in the video
tunnel diode: youtu.be/sdZkGjj9gFY
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Tunnel Diode Manual: worldradiohistory.com/BOOKSHELF-ARH/Technology/GE-Books/General%20Electric-Tunnel%20Diode%20Manual-First%20Edition-1961.pdf
Inductor values used in video: 20uH 440uH
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lets play with a tunnel diode and make some graphs
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Shop tour
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Let' see if we can kill a circuit
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I need to repair my power supply
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sent into the channel for review
update: new firmware fixes the issues shown
Buy: https://s.click.aliexpress.com/e/_op3Da0q
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My spectrum analyzer goes down to 9kHz. using a mixer we can go lower
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this one has me stumped
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similar to: youtu.be/FDxWaegzaXM
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another oscillator circuit using a twin T notch in the feedback
I had already recorded this video, then Alan released his video first: youtu.be/KFVVozlXoOk?si=krxvnZ64ULhIrRSI
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