Search found 1174 matches

by CunningFellow
Sun Nov 18, 2018 4:24 am
Forum: Hardware
Topic: The quest to a portable Uzebox - update!
Replies: 201
Views: 42066

Re: The quest to a portable Uzebox - update!

I'm not sure of the function of C14 in that circuit,

I think an active stage between the AVR and the LM386 could help.
by CunningFellow
Fri Nov 16, 2018 9:52 pm
Forum: Hardware
Topic: The quest to a portable Uzebox - update!
Replies: 201
Views: 42066

Re: The quest to a portable Uzebox - update!

I can give more ideas if you post the schematic. But first thing I would try is the suggestion I made a few posts ago. Straight after the PWM leaves the ATMega644 have it go through a low pass filter and then a unity gain buffer (voltage follower) before going through the volume knob. Hopefully your...
by CunningFellow
Sun Nov 11, 2018 9:55 am
Forum: Hardware
Topic: The quest to a portable Uzebox - update!
Replies: 201
Views: 42066

Re: The quest to a portable Uzebox - update!

good work.

The other thing you can do aside from moving the noise radiator (ESP8266) further away is to lower the susceptibility of the audio amp.
by CunningFellow
Fri Oct 26, 2018 10:56 pm
Forum: Hardware
Topic: The quest to a portable Uzebox - update!
Replies: 201
Views: 42066

Re: The quest to a portable Uzebox - update!

start by putting an LC filter between the ESP VCC and the rest of the circuit to see if the noise is conducted that way.
by CunningFellow
Thu Oct 25, 2018 8:51 pm
Forum: Hardware
Topic: The quest to a portable Uzebox - update!
Replies: 201
Views: 42066

Re: The quest to a portable Uzebox - update!

The noise might be intentionally radiated from the antenna and not GND related. Your input to the Audio section - which I assume is an LM386 - looks like signal goes through an RC filter then a pot. This is possibly going to be a fairly high impedance point for noise to get in. Try adding a short 10...
by CunningFellow
Thu Oct 18, 2018 11:20 pm
Forum: Hardware
Topic: Best buy pcb
Replies: 5
Views: 1563

Re: Best buy pcb

JLCPCB is doing a big push at present.

In the past I have used AllPCB, PCBWay and Elecrow and not had any problems with any of them.

You can look at PCBshopper dot com to get a quick view of many of the options.
by CunningFellow
Tue Oct 16, 2018 8:43 pm
Forum: Hardware
Topic: Official parts list
Replies: 80
Views: 45796

Re: Official parts list

The caps and vreg won't be critical and you can just pick same valued substitutes from a different brand.

I assume the optocoupler is only needed if you want to use the midi output.
by CunningFellow
Wed Oct 10, 2018 11:33 pm
Forum: Uzebox Emulator
Topic: CUzeBox - The new official Uzebox emulator
Replies: 223
Views: 52250

Re: CUzeBox - The new official Uzebox emulator

Run T2K to see a very striking example of what you can see in the ram debug window During the title screen, high score table and credit there is almost nothing happening. The AVR/IO section always has a splattering of red, yellow and green. The stack grows and shrinks in time with the music. The gen...
by CunningFellow
Thu Oct 04, 2018 11:09 pm
Forum: Uzebox Emulator
Topic: All Uzebox Games Online! (Cuzebox and Emscripten)
Replies: 114
Views: 25151

Re: All Uzebox Games Online! (Cuzebox and Emscripten)

nice (pronounced niouse)

It can ever run the RLE demo with the UART interrupt ended scan lines.

Thank you to both you and Jubatian for this :)
by CunningFellow
Wed Sep 19, 2018 11:06 pm
Forum: Hardware
Topic: Trying to burn the bootloader
Replies: 14
Views: 3097

Re: Trying to burn the bootloader

Do you access to a scope (work/friend/hackerspace) ?

Very first check I do if something does not have TV out is to see that the 14.xxxMhz signal is present on fclk of the AD723/725

This is a derived by 1/2 of the 28.xxx Mhz clock of the AVR.