This weekends projects

Discussions about Sinclair ZX80 and ZX81 Hardware
zx-heinz
Posts: 20
Joined: Thu Apr 27, 2017 8:56 pm

Re: This weekends projects

Post by zx-heinz »

Hello Matthew,
nice project. Do you have a spare PCB for me? It would be interesting to compare your board with our recent construction (rune and me) which can be found in
https://forum.tlienhard.com/phpBB3/view ... 188#p45188
The address decoding is much poorer than yours, but the filtering of the sound signal is due to the datasheet of the speech chip. You have choosen a much simpler circuit in contrast to that.
Heinz
mcarlson_sb
Posts: 122
Joined: Wed Apr 08, 2020 4:48 am
Location: San Francisco

Re: This weekends projects

Post by mcarlson_sb »

zx-heinz wrote: Sat Aug 29, 2020 11:07 am Hello Matthew,
nice project. Do you have a spare PCB for me?..
Heinz
I have a few extra of each, DM me

Cheers,
Matthew
mcarlson_sb
Posts: 122
Joined: Wed Apr 08, 2020 4:48 am
Location: San Francisco

Re: This weekends projects

Post by mcarlson_sb »

The fruits of my labor

https://youtu.be/8lsREF6Yufs
mcarlson_sb
Posts: 122
Joined: Wed Apr 08, 2020 4:48 am
Location: San Francisco

Re: This weekends projects

Post by mcarlson_sb »

I finished assembly of the LM386 version
Works great. It's nice to have the reset switch for the SP0256-AL2.
And I can see the volume control being useful in some situations.

The Gerber files for both can be found here
https://github.com/mcarlson-sb/talk-again
20200905_210005.jpg
Post Reply