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Good stuff

Wonderful circuit analysis! I want to know more... like how are you hooking up your mic and output to the breadboard? Is that other breadboard your 555 circuit? I'd love a close up or a combination build video. Thank you for this great vid.

I don't know why YT recommended this, but I'm frankly surprised and slightly relieved to know that replacements for this dumb part actually exist. I was assuming you were going to _make_ a new one.

When I'm doing a repair like this and the conductive part of the rubber contact is worn out I place a thin self-stick conductive pad over it. I use the kind from ButtonWorx, which I got on Amazon. I keep a universal kit of these self-stick pads in stock in my lab (part number BW-70KIT). There may be other brands that do the same thing, but this is the only one that seems to be readily available in my area. This approach has saved many items from the landfill over the years. I have no affiliation with ButtonWorx, I'm just a satisfied customer. (edited to correct spelling).

I’m so glad you did this. I’m sure because of planned obsolescence we’re not going to see any 40 year old electronics being revived in the future.

I can't tell you how cool I find this. I can't work out how this hasn't got more exposure. I can't wait to build a couple!

Why are you following T568B ? I thought USA followed T568A mainly

So I just stuck some adhesive aluminum duct tape underneath the button and it reestablished the conduction, i dont know how long this will last but it works for now atleast thanks for educating me on how these buttons work.

Can someone help how this solder iron is working without 24V power Supply?

I'm confused about the power supply for this soldering iron, which requires 24V to function. The circuit doesn't appear to include a 24V transformer or any other obvious means of providing the necessary voltage. Can someone explain how the iron is being powered in this setup?

I am interested, how to decoding Call Progress using esp32 without extra ic tone decoder eg. cmx673, cmx683, and so on

I followed the PTC schematic before I found your video and I immediately get a 2.5V drop on my 5V rail after you connect it to the chip. Any ideas on what I’m doing wrong? Is it worth troubleshooting or should I just look into a chip analysis like you described here. Much appreciated!

Try re capping the console that might take care of it.

Very thorough. That punchdown holder is pretty essential. It really sucks to have that punchdown slip and go into your palm.

So my RX is 5V as well, while the TX is 3.3v This is when powering from USB. Powering from 3V3, RX is 2.6V and TX is 3.3V.

I usually buy the versions that use an external antenna so that I have some freedom to get better signal coverage.

Very good explanation. USB IC provides the level shifting when it is connected to a 5V USB port. Why CH340 is connected to 5V? Doesn't cost anything, in fact they could have saved those 2 resistors. About the RSSI, would like to see the difference between the original modules from ESSPRESSIF and the clones.

Nice find, clever fix, interesting mystery...

Long rows of pins with ABS plastic on top ... oh so hard to un-solder. Happy to find your 2nd channel!

Creative video, thank you :)

Thanks much. Very cool. I have an old crank style phone, a dial wall phone, some old modems, and some 8 bit computers. I'd like to set up my own phone system for testing and demonstration of this equipment. Calls, ringing phones, BBS on Apple ][ etc... Is your board available as a kit from JLPCB or PCBway?

Thank you this was amazingly helpful and a good speed for me :) not too fast and very clear <3

I much prefer Visual Studio code with the PlatformIO plugin. Arduino code still works with minor changes. None of this digging through a 100 menus to find the correct CPU/programmer!

Are we talking WS2812B style LED's here? I do love using the little chips. I just write my own bit-bang drivers for these, unless the chip has some form of DMA output.

I've had good luck with the ButtonWorx repair kits (on Amazon). They're self-adhesive and they stick to the PCB instead of the button. They have a thin spacer built in that keeps the conductive pad just above the surface of the PCB. Remotes I repaired around 2 years ago are still working fine under daily use.

Why sometimes LTSpice simulations very slow, maybe you know how to speed up the simulations?

Interesting take on a custom ATtiny breakout board. You exposed the three most common serial interfaces, added onboard TTL serial to USB, and broke out the remaining four I/O pins. I could see how that could be useful for generic experimentation using this ATtiny series. Cool!

Can I buy this PCB somewhere? Is the source code and diagram for this PCB available somewhere?

I was not able to locate the I2S.h, thus had zero luck with the sketch. Still wish I could get your previous effort working on the mega, it really works nice on the uno. thanks for sharing!

Good job . I want to build a dtmf dialer by esp8266 and i use tone to build 2 frequencies on 2 pins but when i dial by it , wrong number message heared. Can you help me to solve this problem?

Best to check the battery and check your camera can film infra red leds first 😂

Just a thought, superglue might be a bit brittle for this kind of use. I might try some form of rubber contact glue it's a bit more flexible Superglue is no good in shear type force, so any flexing could lead to the joint parting ways.

Great simple repair. I gotta get me a box of those replacement pads - there's a couple of remotes around here that haven't responded to just cleaning them.

Where would I find the filter calculator??

Great product, I was looking for this . We should work together.

For MacBook how can I open top dictionary?

at 7:20 you ask what it means: "Any not specified set to 000". It simply means taht whatever register is not in the list, you set it to 000. So all unused registers to 0.

its not working. i used ay 3 8912 i only hear clicks and 1 one at the end

Helped with my simulation homework, thank you!

Funny I was thinking about doing this. It’s essentially a GigRig G2 perhaps?

i could only find transient.cir file and thats not working. I cant find model file for lm358. please sir share it please

Fascinating stuff. The only thing that I am struggling with is the multiple waves. In the case that both sine waves are at their peak and you add them together, you will be outside of the DACs range. In analog synthesis, if you pass an op amp's range the signal will clip. I didn't really get what the equivalent was of this in digital synthesis. You shift each data point by one bit, so essentially dividing by 2 before adding correct? This way it won't exceed the DACs range? And if you wanted to use 3 waves you would have to divide the values by 3? Doesn't this decrease the resolution of the wave because when you divide you may be rounding values off? Or does it not matter because once you add them back together you still use the full range of the DAC?

In this little field of Poppies, Poppies, Poppies, Poppies, ..... Found several of these while attempting to inventory my junque (box?, room? area?) again. Or still for the last 20 years. it breeds.

Looking forward to the inevitable guitar pedal implementation.

Following this series avidly as it evolves - thanks.

I've watched all of your "episodes" in making this and I love it! I originally came to see how I could make an "old" phone tester, testing pulse dial or DTMF to BCD so to display the dialed number on a 7 segment display; .also using the SLIC just to provide ringing current. Now I may make a phone to phone demo board of my own! You sir, have expanded my horizon; thank you so much. Incidently in the UK we call the Central Office the Exchange. Also watching earlier " episodes" it struck me that perhaps you could hive off the service signal generation to another processor and just call the tones as required...

The stand works if you place the groove on the iron just above the nut onto the notch in the stand plate.

Thanks for this video, it was helpful and cleared up some confusion about how to import symbol parameters into a file!

Awesome information and video.

Isn't the second circuit, the band amplifying filter, just an oscillator? How do you stop it from doing that? The Twin T has a 180 deg phase shift, the op-amp inverts the signal, another 180 deg and it has plenty of gain. 2 pi around the loop and gain >1.