Yes, what is your question ?

@@NetworkXIII For some reason I just saw your reply. My question is about cloning an ftdi chip information. Can I have your email or whats app to text you? Thank you!!

I’ve never tried. I suppose it depends on what exactly is wrong with it, and if parts are still available.

@MaximRecoil There will be a part four if and when I feel like shooting and editing it. I don't get paid to make these videos, and you don't pay to watch them. I reassembled the hook switch about four years ago without any issues. You phone experts seem to equate it to taking a Rolex apart and then trying to reassemble it blindfolded while on a rollercoaster. I shot photos and made good notes when I took it apart, so it wasn't much of a challenge to put it back together (scroll down about ten comments for a similar scolding concerning the hook switch from another know-it-all.) I always welcome constructive comments from viewers, but if you're just here to bust balls or troll, please do so in someone else's comment section.

@@NetworkXIII I like your videos, and I take to heart that you don't make money from making them. However, MaximRecoil asked a legitimate question, and proposed a likely scenario. Please don't be upset when folks are curious about your videos.

I think @MaximRecoil desperately awaits part 4. Give it to him, please.

Good question, I don’t know how to overwrite the data in the DS2401, or what NVM technology they are using, so it may not even be possible. You could probably use one of the simpler PIC microcontrollers to reproduce the functionality of the 2401, and you could obviously write any s/n you want into that. Sounds like an interesting project

@@NetworkXIII do you think that ALL of the battery packs have the same serial number that Apple would have programmed onto the the DS2400 or do you think that the serial number on it is just the default that is on the DS2400 from the factory so each battery has a unique number? In that case I could just purchase a batch of them and be done and no need to read or write them. What I do know is the Ds2400 is required in the battery pack. If I try to power the laptop up without it it won’t boot. Once I connect the original DS2400 then it boots right up.

⁠@@sideburnApple likely buys them in lots where a sequence of unique serial numbers are already burned into the NVM, that way they don’t have to worry about programming them.

@@NetworkXIII hmm well these are from the 90’s. I guess the only way to find out is to try a. Of the shelf 2400 and see how it goes.

​@@NetworkXIIImask rom most likely, no reprogramming possible

Are you referring to the users manual? I’ll try to find it this week and will get back to you.

The green LEDs should work OK, I would try the 3V circuit on the upper left of page four of the datasheet, and try a 1000uF cap with the 39 ohm LED load resistors. Let me know how it goes.

Thank you for replying. The circuit on the upper left of page four shows one LED configuration. To confirm, you are suggesting to use this configuration in the datasheet and I should try putting my six green LEDs in parallel with each other, with each LED having a 39ohm resistor in series with it?

Following up: I connected the six LEDs with six 39ohm resistors along with a 1000uF capacitor (using the circuit on the upper left of page four as you suggested). I set my multimeter to capture max. current. For six LEDs the current draw was 6.1mA. The current through a single LED was 0.78mA. Reducing the capacitor to 330uF resulted in a draw of 2.59mA, and current through a single LED was 0.27mA. Thank you, this works great! -- BTW: What is the purpose of the 39ohm series resistors in this circuit? Are they acting as current limiting resistors? (Increasing the capacitance caused a delay in blinking, though the brightness was higher and so was the total current draw. )

@ vanfifty139 Yes, the 39 ohm resistors are to limit LED current. You may or may not need them, or may be able to adjust the value.

Not for this model, it is a bare-bones entry level Chromebook.

The crystal manufacturer put the example circuit using the logic gate in their datasheet.

@@NetworkXIIIOverload I have see so many of these oscillating on an harmonic. You need a special inverter to garantee that the circuit w orks all the time.

@@y_x2 It worked just fine for me.

@@NetworkXIIIOverload It was a disaster in production! They disappear in the 1990s.

@@y_x2I wonder how did these harmonics occur？

It was five years ago, I don’t remember why I was laughing

Glad it was helpful!

I don’t see why not, if the Arduino can read back the characters it is sending out it is a good sign.

The 555 and 4026 will work with a 12V supply, you will probably have to adjust some of the resistor values

@@NetworkXIII which resistors has to be changed please sent the circuit diagram

I made a video on an electronic die kzfaq.info/get/bejne/pcVyacd315q5mZs.htmlsi=_RWumOIqS4Tn5Z_s it uses a 4022 that counts 0-5 then resets. There may be a counter that outputs in binary or BCD that you can reset in the same way.

It has been a few years now, so I don’t recall exactly what I said in the video, but 300 mil DIP is no longer a preferred package for new designs. Its great that you can still find old legacy parts like LM339 in DIP, but they’re not going into your new iPhone.

Im just old school and you count not give me anything apple.@@NetworkXIII

I'm only finding the DS2401 on DigiKey's website. There is currently an eBay seller in China that is offering five DS2401s in the TO-92 package for $3.53 with free shipping, that may be the best deal out there.

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I just reprogrammed this one, not sure if it was read-protected or not.

Component values were provided by the manufacturer: source.z2data.com/2016/10/5/8/38/8/944/180020/ecs-3x8.pdf

​@@NetworkXIII i want to give the gps trigger from Arduino to the oscillator circuit which works in hertz i.e output square wave in mega hertz so how to do it??

@@NetworkXIII please reply

@@sanskrutivs9435 I'm not sure of the maximum output frequency from an Arduino digital pin, it depends on which Arduino board you have.

There is a playlist containing all of the desk phone restoration videos

Bell would refurbish and update the phones when they were returned from a customer, I suppose it is possible that a 1961 chassis could have been fitted with modular jacks.

I believe my baud rate was 9600bps, you can increase the baud rate but there is a limit, though I’m not sure what it is. The datasheet for the FTDI chip will have that information.

sort of, its more for higher frequency audio

@@NetworkXIII thanks!!

Thank you

Yes, the minimum Vout for the TL431 is 2.5V.

Can use a medium current/power transistor wired as an amplified diode. There are 2 potential divider resistors placed across the collector, base, and emitter leads of the transistor. Use is similar to a zener diode with a series limiting resistance. Make sure the total potential divider resistors are about 10 times the limiting resistance value for satisfactory performance. Equal resistor values produce about 1.2 to 1.3 volts. Potential divider output voltage calculation: 0.65 × (Rpd1 + Rpd2) ÷ Rpd2