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11 Jul 2020 04:29:26 UTC
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Phone Line Simulator Experiment
Another step of progress toward getting two dial up modems to talk to each other without a phone line.
Using a battery and resistor, the modem can now sense a current loop and try to answer or dial out on the line.
But not before debugging one dead modem, one dreadfully defective serial cable, and hacking together a lot of wires.
POTS (Plain Old Telephone Service) Info:
https://en.wikipedia.org/wiki/Tip_and_ring
http://www.epanorama.net/circuits/teleinterface.html
Serial Cable Pinouts:
http://www.bb-elec.com/Learning-Center/All-White-Papers/Serial/FAQ-RS-232-Connections-That-Work.aspx
Patreon: https://www.patreon.com/gadgetreboot
Pinterest: https://www.pinterest.ca/GadgetReboot
Twitter: @GadgetReboot https://twitter.com/gadgetreboot
...
https://www.youtube.com/watch?v=Nwtq6AJtfTI
Using a battery and resistor, the modem can now sense a current loop and try to answer or dial out on the line.
But not before debugging one dead modem, one dreadfully defective serial cable, and hacking together a lot of wires.
POTS (Plain Old Telephone Service) Info:
https://en.wikipedia.org/wiki/Tip_and_ring
http://www.epanorama.net/circuits/teleinterface.html
Serial Cable Pinouts:
http://www.bb-elec.com/Learning-Center/All-White-Papers/Serial/FAQ-RS-232-Connections-That-Work.aspx
Patreon: https://www.patreon.com/gadgetreboot
Pinterest: https://www.pinterest.ca/GadgetReboot
Twitter: @GadgetReboot https://twitter.com/gadgetreboot
...
https://www.youtube.com/watch?v=Nwtq6AJtfTI
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I DES
i-designed-a-half-broken-circuit
PCBWay Supports High Precision Advanced PCBs: https://www.pcbway.com/
This is a new version of a previous color organ project where I hoped to make improvements, and although it's better, I made 1 or 2 mistakes so I have to re-build part of it on a breadboard while testing out the partially soldered PCB.
I explain what went wrong and how it should have been designed, then I go through some bench testing with the corrected design on the breadboard.
Original color organ project https://youtu.be/-l-9Bik1qLQ
Bandpass filter calculators
http://sim.okawa-denshi.jp/en/OPtazyuBakeisan.htm
http://www.learningaboutelectronics.com/Articles/Bandpass-filter-calculator.php#answer2
Op Amp input bias app note
https://www.analog.com/media/en/training-seminars/tutorials/MT-038.pdf
If you'd like to support the channel, you can:
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#ElectronicsCreators
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mailbag-thermocouples-modules-drivers
In this Electronics Mailbag:
Received an RTC Arduino Module, Dual PWM DC Motor Driver, Step up Boost Converter, Heat Shrink Tubing multi pack, and
Thermocouple woes... Trying to get a thermocouple working to test the output temperature of the hot air rework station, I can't get a fancy Extech meter or a cheap Ebay meter to work with a K type probe.
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https://www.youtube.com/watch?v=iZu1cWASU4c
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PCF85
pcf8574-i2c-gpio-expander-tutorial
Getting familiar with using the PCF8574 GPIO Expander with Arduino, including using it as outputs, inputs (polled and interrupt driven), addressing multiple devices on the same bus, and limitations on using this device.
Arduino Sketch:
https://github.com/GadgetReboot/Arduino/tree/master/Uno/PCF8574
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Pinterest: https://www.pinterest.ca/GadgetReboot
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mailbag!-attiny-0-series,-dual-coil
Items from AliExpress (Affiliate Links)
100pcs 3*6*2.5MM SMD micro/key switch high temperature resistance 2P
https://s.click.aliexpress.com/e/_AkbCbN
PH 2.0mm PH2.0 2/3/4/5/6/7/8-16p Bending/Straight needle Horizontal/Vertical SMD Wire Connector Terminal Kit/Housing/Pin Header https://s.click.aliexpress.com/e/_99Gktz
20pcs For Soundcraft Mixer Fader Cap Knob / Slide Potentiometer Push Button T-type hole for Yamaha https://s.click.aliexpress.com/e/_AUIzkf
CH340G SOP-16 CH340 USB serial interface chip https://s.click.aliexpress.com/e/_AabeIn
2n7000 Small Signal N-Channel TO-92 TO92 IC 60 Volt Transistor 100% MOSFET https://s.click.aliexpress.com/e/_AMSlvp
Polypropylene Film Capacitor, 63V, 100V, 250V, 400V, 450V, 630V, 2000V, 101V, 103V, 104V, 105V, 221V, 222V, 223V, 224V, 125J, 225, 332, 333, 334 https://s.click.aliexpress.com/e/_9ir1L9
Mouser key items
ATTiny1604 https://www.mouser.ca/ProductDetail/556-ATTINY1604-SSN
6.3v Incandescent Bulb https://www.mouser.ca/ProductDetail/560-47
5v LDO NCP1117IST50T3G https://www.mouser.ca/ProductDetail/863-NCP1117IST50T3G
Low signal dual coil latching relay EA2-5TNJ https://www.mouser.ca/ProductDetail/551-EA2-5TNJ
Op Amps
NE5532AP https://www.mouser.ca/ProductDetail/595-NE5532AP
NJM4556ADD https://www.mouser.ca/ProductDetail/513-NJM4556ADD
RC4559P https://www.mouser.ca/ProductDetail/595-RC4559P
TLC272BCPE4 https://www.mouser.ca/ProductDetail/595-TLC272BCPE4
TL072ACP https://www.mouser.ca/ProductDetail/595-TL072ACP
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mailbag!-21
TM1637 LED Display https://s.click.aliexpress.com/e/_DDs0CUL
USB Type C data cables https://s.click.aliexpress.com/e/_DEALbmL
MCP6002 Dual Rail to Rail Op Amp https://s.click.aliexpress.com/e/_DDS418B
Needle tip squeeze bottle dispenser https://s.click.aliexpress.com/e/_DChYnix
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MCP23s17 GPIO Expander https://s.click.aliexpress.com/e/_DeTETBH
SOT23 to DIP adapter pcb https://s.click.aliexpress.com/e/_DkIcOVd
1/4” Phone Jack with threaded insert https://s.click.aliexpress.com/e/_DkwZsOr
1/8” Coiled TRS cable https://s.click.aliexpress.com/e/_DDpDk8j
1/8” Weaving TRS cable https://s.click.aliexpress.com/e/_DdWdxxV
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ISOLA
isolated-power-relay-rs485-pcb-using
PCBWay Supports High Precision Advanced PCBs: https://www.pcbway.com/
This PCB project uses a 5v to 5v isolated power supply module, PC817 optocouplers, and an ADUM1201 digital isolator to provide a way for 5 volt projects to interface with other hardware that requires galvanic isolation.
There is an on-board RS485 interface, which when routed to the digital isolator can allow projects such as Arduino DMX controller interfaces.
Schematic:
https://github.com/GadgetReboot/GR_ISO_Board
Transistor Switch Design Info:
https://www.electronics-tutorials.ws/transistor/tran_4.html
https://www.petervis.com/GCSE_Design_and_Technology_Electronic_Products/transistor_base_resistor_calculator/transistor_base_resistor_calculator.html
RS485 Info:
https://datasheets.maximintegrated.com/en/ds/MAX1487-MAX491.pdf
https://www.ti.com/lit/an/slyt514/slyt514.pdf?ts=1594401193315&ref_url=https%253A%252F%252Fwww.google.com%252F
https://www.maximintegrated.com/en/design/technical-documents/tutorials/7/763.html
Optocoupler Info:
https://learnabout-electronics.org/Semiconductors/opto_52.php
https://www.nutsvolts.com/magazine/article/optocoupler-circuits
https://www.renesas.com/us/en/products/optoelectronics/technology/ctr.html
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BYPAS
bypass-capacitors-in-audio-circuits
I forgot to add a bypass capacitor across the voltage rail of a DC bias supply and it caused my analog signal to bleed through to the output of the circuit when it was supposed to be "off".
Using a combination of calculations and LTSPICE simulations I figured out a capacitor value that should work, then I tested it in circuit. I ran into another signal anomaly but that's for another day...
Download LT SPICE
https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html
SPICE simulation files for this video
https://github.com/GadgetReboot/misc_file_bin/tree/master/2019-05/BypassCapSimulation
Impedance calculator
https://keisan.casio.com/exec/system/1258032649
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Background music from the Youtube music library:
A Rising Wave by Jeremy Blake
Ridge Racer by DivKid
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https://www.youtube.com/watch?v=KidsecXSRg0
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DUAL
dual-stacked-stereo-audio-phone-jack
PCBWay Supports High Precision Advanced PCBs: https://www.pcbway.com/
For projects that need a lot of 1/4 inch phone jacks, such as audio mixers or loop switchers, having a PCB with dual stacked jacks can make things more organized and easier to work with.
Design files: https://github.com/GadgetReboot/Stereo_Jack_Breakout
Phone jack: Neutrik NSJ12HF-1 https://www.mouser.ca/ProductDetail/568-NSJ12HF-1
Order PCBs from PCBWay: https://www.pcbway.com/project/shareproject/Dual_Stacked_1_4_Phone_Jack_Breakout_Board_8c83ed54.html
If you'd like to support the channel, you can:
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#ElectronicsCreators
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TTP22
ttp229-capacitive-touch-sensor-module
I had trouble getting the TTP229 capacitive touch sensor module working with Arduino until I figured out that there's different versions of the chip, and mine doesn't speak I2C.
After trying multiple libraries and searching the forums, I finally found a working solution.
Sketch & Schematic
https://github.com/GadgetReboot/TTP229_Capacitive_Touch_Sensor
Original sketch that worked when all else failed
http://itimewaste.blogspot.com/2014/12/arduino-code-for-ttp229-touch-16-button.html
Various datasheet/module schematic info
https://www.openimpulse.com/blog/wp-content/uploads/wpsc/downloadables/TTP229B-Schematic-Diagram.pdf
https://pdf1.alldatasheet.com/datasheet-pdf/view/810504/TONTEK/TTP229-BSF.html
https://www.openimpulse.com/blog/wp-content/uploads/wpsc/downloadables/TTP229-Capacitive-Touch-Sensor-Module-16-channels-Datasheet.pdf
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