Looks amazing as the kids say "Well Jell!!!" 🤣🤣🤣🥳🙌🌟👍💯😁👋⭐

So envious, have a great time 👍

🎃

Hi! Yet again, thanks for helping us with the Sinclair Multimeter repair 🫡🫡 Moving onto Sinclair ZX Spectrum micros, me and my other half, would rather stand by the original (out of Sinclair factories re-furbished by people like us) computers anytime. Why don't we try to keep Sinclair as original as possible? At 53, we just find that the modern idea of a Sinclair Spectrum, is an insult to the late Sir Clive, and as such will always fall short.

⌨️

Thanks, those components are small, might need my glasses👓

I managed to pick up lots of hints tips and tricks for SMD work from some of the youtube channels that deal with diagnosis / repair of more modern kit (such as Joey Does Tech, The Cod3r, Northridge Fix etc.). Even if you're not especially interested in what they are fixing, the techniques they use come in handy for this kind of stuff too.

This was fun. We finished treasure island dizzy! Must sort out my microphone settings

Good work. Thank you for making the effort to make these videos.

🌞

When removing solder bridges try dragging in the direction of the pin instead of at right angles.

One tip for you: Keep your soldering iron tip clean! I mean sparkling clean. A dirty tip is an inefficient tip. Another tip for you: Refer to the Pico as a Pi Pico and not a Raspberry Pi! Totally different boards so the distinction is important. The Raspberry Pi is a single board computer. The Pi Pico is a microcontroller board.

You can use a gumfix to position correctly in place connectors before soldering them. Sometimes I use painting tape too.

I think those keyboard adaptors are passive and only work with keyboards that are designed for USB and PS/2. You can get proper active adaptors, but I have found them to be hit and miss as well.

nice gesture bro!

Flux pens are for the birds. Get a syringe of tacky flux.

So many upside down resistors, my OCD is going off... :) For drag soldering a 'K' tip works a lot better than the wedge you're using.

I really wish you had put all the resistors the right way up. Otherwise enjoyed watching, must get my soldering iron warmed up!

Great job I'm really enjoying watching your SMD soldering journey - very cool and brave to be so open with comments on all of it and trying people's suggestions, not easy to put yourself out there like that.

I'm wondering why they didn't route audio through the HDMI?

It's a small thing, it's not important but it does make my teeth itch - that isn't a Raspberry Pi, it's a Raspberry Pi Pico - they're different things. The former refers to the single board computers.

as far as the HDMI port. next time get some kapton tape, and just line it and press the tape down to hold it in place. then flip it over and solder. that will keep it aligned.

FWIW, when the components stand up, it's called a Tombstone. Lewis Rossmann tends to flood with flux when doing rework, no bad thing.

🧹

Does it have all the audio capabilities of the 128K?

7:25 seeing c64 on a speccy is crazy!!

Nice work, as always! I can't help thinking that hacking an original speccy keyboard on to this board would be the way forwards, especially for the coders amongst us... Way outside of my skill set and ability, but I'm confident you could force the two to play together...

There is another very easy speccy emulator to assemble with the pico, get a waveshare rp2040 pizero (not the pico zero) that already has the sd card, the USB and HDMI slots and flash the pico-zxspectrum. That's it, you get a full zx spectrum with HDMI and usb keyb/pads ;)

Thanks for the content

Nice SMD work. I need to give paste another go. When you do the 1.4 board, see if PCBWay can make a solder stencil too. may help with the application of paste. Nice project too.

I have a number of Pico clones with 16 MB of flash. using them for an Atari cart project. Can the ZX emu SW use this flash too?

Se podría hacer también con una esp32, imprimir 3d la caja del z80 y teclado del zx spectrum controlado con un arduino nano. Buen trabajo👍👌🏻

How do you connect a joystick?

Am I missing something here? The location of the gerber files isn't obvious.

I have same one, love it since I like all Sinclair 😊. Mine had blown current and resistance measurements, one op-amp in LM3900N was blown. After replacement it works fine.

I bought a Hantek 4032L a while back. 32 channels, 400MS/s (150MHz bandwidth), 2Gbit memory depth etc. It currently sells on AliExpres for about $175. Now, this might seem like a screaming bargain, and in some ways it is, but... The device is really solid and well made, but the software SUCKS something AWFUL! For starters, the driver they provide is windoze only (WinXP/2000/Win7), and hasn't been updated in over a decade. Their software is just embarrassing! Honestly, I almost returned the thing. However, I did manage to get the driver working on win 10 by disabling the windoze driver signature enforcement. Also, it turns out that the logic analyzer is supported by Sigrok's pulseview, so I just ditched the software that came with the device. The probes were pretty crappy too, so I bought some silicone rubber coated wire, along with some half descent probe clips, and made my own (colour coded and labelled, since keeping track of 32 grey wires can get a bit confusing.) These things out of the way, it now seems to work quite well and I'm super happy with it. The flaky driver does still (rarely) crash, but when it's working, it's really good. pulseview has a TON of protocol decoders, including a Z80 decoder which I used to debug a flaky retro Z80 build. Turns out the SRAM chip was screwed. I could see this because I had 16 address channels, 8 data channels, and a bunch of other Z80 signals all being displayed in pulseview. The decoder printed out the exact Z80 instructions and correct data, right up to the moment control was passed to the SRAM chip ... at which point everything turned to gibberish. On the driver issue: I decided to try the logic analyzer under Linux (Ubuntu), and was very surprised to see that there were no issues at all with the driver. I installed pulseview ... and it just worked. I'm not necessarily recommending this device, a DIY version is a perfectly valid response to some of the obscenely expensive equipment on the market these days. But I throw this out as an inexpensive, though potentially frustrating alternative.

The circuitry is offensive to the eyes! The whole construction is completely shoddy. I think those ganged switches are supposed to be for record players/audio. I would not trust those presets either. It's basically using the cheapest nastiest components available at the time. Compare to a HP instrument of the same period and you will see how it is supposed to be done. No wonder the firm went bust. British industry as a whole went bust as I recall.

Can this analyzer HW works with pulseview under linux ?

Hello how much would you charge to fix this problem on my grey +2 spectrum?

Polywatch and a microfiber cloth would polish the scratches away on your purple plastic cover

Good stuff!

Hi sorry can't find your email address. Cheers

I'd like a set of the logic probe PCB's if possible.

You don't need to cover every pin. The solder will flow under the contacts. Too much past on small parts (I think the smallest you had there were 0603 imperial? Can cause the parts to float off or "tombstone" which is PITA. You don't need to put resistors, capacitors the right way up but it makes things easier if you do and have to check the values later.

We have a Sinclair DM2 fully working, with a fully working display, but with no probe acknowledgement. Thanks Mr R...o C......r. That is as far as we'll go with the offending gentlemans channel. Nina.

About 3 years ago, we purchased s Sinclair DM2, with a rotted battery (plus rotted battery snap) off E.....y. It turned out that the circuitry was fine, as tested by my bench power supply. I then make a mistake, I order a new battery snap off a chap who has his own YT channel (I will not mention his name or channel). Needless to say, the battery snap was INCORRECTLY WIRED. For the last 3 to 4 years we have a Sinclair DM2, which works, but the display no longer displays a 9volt battery reading from a 2kohm resistor. Any ideas as to what has failed? Nina. And thanks for another fantastic video. 👏👏👏👏👏👏👏👏❤️❤️❤️❤️❤️❤️❤️❌️❌️❌️❌️❌️❌️😊😊😊😊😊😊😊😊😊😊😊

Thanks 👍

Where are the PCB-s? If I decide to buy ones - what to do?

Imagine how much smaller (and cheaper?) this would be if it would just integrate the rp2040 chip directly with everything else on a single PCB ...

I had the earlier meter with the hinged polypropylene range switches and a Nixie tubes display. It worked well enough for the precision required for most projects in those days.