Search found 275 matches

by McKlaud
Thu Mar 26, 2020 7:40 pm
Forum: Hardware
Topic: I started on my new ZX-81 replacement board (kit) ZX81+38
Replies: 22
Views: 10414

Re: I started on my new ZX-81 replacement board (kit) ZX81+38

Looks great and thank for sharing.
by McKlaud
Mon Mar 23, 2020 5:55 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 86
Views: 31855

Re: Jupiter ACE (again)

Working from home these days and sorting out unfinished project in mean time. Sticker to my Jupiter ACE replica's keyboard finally done.
by McKlaud
Wed Mar 18, 2020 8:18 am
Forum: ZX Spectrum Lounge
Topic: Photo of my TC-2048
Replies: 6
Views: 6000

Re: Photo of my TC-2048

The hi-res schematic attached in the ZIP file.

Regarding Mark's query, any European TC2048 has got a UHF modulator which works on Channel 36. Timex used at least two makes of them, ASTEC UM1233 and Gintek UM-236E-1.

Image
by McKlaud
Sun Feb 23, 2020 8:23 am
Forum: ZX Spectrum Lounge
Topic: Photo of my TC-2048
Replies: 6
Views: 6000

Re: Photo of my TC-2048

Hi,

Your TC2048 looks nice and I like the bright and good looking keyboard.

Anyway, there could be an issue with the RF modulator if the composite output works fine. The most accurate schematic diagram of rev.5 attached.
by McKlaud
Sun Feb 16, 2020 10:06 am
Forum: Hardware
Topic: Superfo Cartridge Interface
Replies: 5
Views: 1604

Re: Superfo Cartridge Interface

No, they are not. It was not an open project. Please see SMR where superfo sells them. If can't find any, send me a PM, because I've got one spare PCB if you are interested.
by McKlaud
Thu Feb 06, 2020 8:56 am
Forum: ZX Spectrum Lounge
Topic: Source of 200ohm speakers?
Replies: 11
Views: 2729

Re: Source of 200ohm speakers?

200Ohms speakers are not available, the closes what you can find are 150ohms units. Google for: AR027150MR-2-R, it might be a good replacement for the issue 2 speaker.
by McKlaud
Tue Jan 28, 2020 8:50 am
Forum: Hardware
Topic: Issue 4a docs needed
Replies: 45
Views: 11531

Re: Issue 4a docs needed

Looking at the issue 4a schematic, there are other parts worth checking like TR5 and both diodes D15 & D17.

BTW is any of memory chips getting hot?
by McKlaud
Mon Jan 27, 2020 10:15 pm
Forum: Hardware
Topic: Issue 4a docs needed
Replies: 45
Views: 11531

Re: Issue 4a docs needed

I am worried at the electrical "hum" from the 4A, and the low 12V line (10.8V) - any suggestions appreciated I would not worry much about the hum, it seems that coil's windings became loose. I would worry about very low 12V line. As a first guess I would replace TR4 (ZTX650 type) with new one or ZT...
by McKlaud
Sat Jan 25, 2020 11:31 am
Forum: Hardware
Topic: TS1510 CLONE
Replies: 21
Views: 156661

Re: TS1510 CLONE

Long shoot but built and tested the clone and the cartridge: https://drive.google.com/open?id=1Gxqjv ... ytl58aGcAa
by McKlaud
Wed Jan 22, 2020 8:46 pm
Forum: WANTED
Topic: SD card reader for ZX81
Replies: 14
Views: 4948

Re: SD card reader for ZX81

There is also renewed ZX1541 on the market which works with any SD2IEC well.