For identification, it may be helpful to those newer to electronics. More a belt and suspenders thing, I suppose, to minimize assembly errors.
Definitely a good thing for soldering. That board has quite a ground plane. Working on vintage power supplies, I do keep my big ol' Weller soldering gun nearby for just such an occasion.
Looks good. I wonder if you could fit the audio power amplifier in there. A good place for it would be directly in front of the power supply, on its own partitioned ground plane section, star-earthed at the PSU common. That way you won't have the heavy speaker currents (up to several hundred mA) pumping through your board interconnects and ground plane.
Initially I had planned on two 250x250mm boards stacked, however tonight I've discovered I may be able to fit everything on a single 250x350mm board. The price isn't that much higher for the extra board size ($14 for a single board) but we save by only needing one board.
Initially I had planned on two 250x250mm boards stacked, however tonight I've discovered I may be able to fit everything on a single 250x350mm board. The price isn't that much higher for the extra board size ($14 for a single board) but we save by only needing one board.
Sounds good to me.
Looks good. I wonder if you could fit the audio power amplifier in there. A good place for it would be directly in front of the power supply, on its own partitioned ground plane section, star-earthed at the PSU common. That way you won't have the heavy speaker currents (up to several hundred mA) pumping through your board interconnects and ground plane.
I worked on the Sound section tonight. The amplifier is pretty small and easily fits next to the power supply.
Don't forget a 50hz/60hz switch. With this, since there is no color, the mono video would work with most TV and video capture cards around the world. Only the capture cards with super-strict H&V timing, ie they wont support VCR playback in some cases, will fail to lock onto your video.
Looks good. I wonder if you could fit the audio power amplifier in there. A good place for it would be directly in front of the power supply, on its own partitioned ground plane section, star-earthed at the PSU common. That way you won't have the heavy speaker currents (up to several hundred mA) pumping through your board interconnects and ground plane.
I worked on the Sound section tonight. The amplifier is pretty small and easily fits next to the power supply.
Looks neat but that's a tiny loudspeaker! Have you used one of those before? I hope the amplifier isn't too powerful for it and deflects the cone to Xmax at 1/4 volume.
BTW, if you're not ponged out already and think you might be hankering for another PCB layout project after this is done, I'm currently well into soldering something together which is taking this discrete transistor Pong thing to another level
Actually I intend to implement a fully colour-encoded composite video signal. It's going to be PAL only (15625Hz H, non interlaced, 312 lines V, 50.08Hz).
...snip...
My score counters shown as single digit in my prior post have since been increased by 1/2 a digit to count from zero to 19. I realised that all this added to my score counters in the way of further complication was an additional carry/overflow flip-flop to activate the 1/2 segment, which is trivial enough to accommodate. So my (currently completed) horizontal video generator board (300mm x 150mm) now also produces a discrete video signal high during horizontal timing interval #6 and another high at #18 for the 1/2 segments. The player to reach 19 wins first will be the winner.
Also I've divvied the paddles into sections and the ball will deflect at 45 degrees if it hits the middle section and 67.5 degrees if it hits the outer sections. The bat sizes will also be variable. I'm looking forward to reaching the stage where I can start it take some raster display photos.
Looks good. I wonder if you could fit the audio power amplifier in there. A good place for it would be directly in front of the power supply, on its own partitioned ground plane section, star-earthed at the PSU common. That way you won't have the heavy speaker currents (up to several hundred mA) pumping through your board interconnects and ground plane.
I worked on the Sound section tonight. The amplifier is pretty small and easily fits next to the power supply.
Looks neat but that's a tiny loudspeaker! Have you used one of those before? I hope the amplifier isn't too powerful for it and deflects the cone to Xmax at 1/4 volume.
BTW, if you're not ponged out already and think you might be hankering for another PCB layout project after this is done, I'm currently well into soldering something together which is taking this discrete transistor Pong thing to another level
Uh oh. Glen, did your site get too much traffic? Seems to have been suspended.
Actually I intend to implement a fully colour-encoded composite video signal. It's going to be PAL only (15625Hz H, non interlaced, 312 lines V, 50.08Hz). Attempting to accommodate both the PAL standards and the different frame/field rate and vertical resolution of NTSC as well as the alternate colour encoding isn't something I could be bothered with; and more so since I don't have an NTSC TV or monitor to test it with! If this turns out to be a project that anyone in a non-PAL land feels like replicating the option there is to play discrete transistor pong on your modern flat screen TV courtesy of a composite video to HDMI converter, I guess.
Actually I intend to implement a fully colour-encoded composite video signal. It's going to be PAL only (15625Hz H, non interlaced, 312 lines V, 50.08Hz). Attempting to accommodate both the PAL standards and the different frame/field rate and vertical resolution of NTSC as well as the alternate colour encoding isn't something I could be bothered with; and more so since I don't have an NTSC TV or monitor to test it with! If this turns out to be a project that anyone in a non-PAL land feels like replicating the option there is to play discrete transistor pong on your modern flat screen TV courtesy of a composite video to HDMI converter, I guess.I wonder if RGB VGA might be a more versatile choice.
All color for a pong game, in transistors. Wow. I mean WOW! If you were to do monochrome, all you had to do was change your vertical counter to 265 to support all the 60hz formats. The horizontal is close enough and the text would be a little stretched, or, you could say the text would be a little squished when operating in any 50hz system, PAL or Secam...
Just had a quick lunch break peekaboo and my site is back on-line. Was just a misinterpretation, not an issue to devote any further thought to! Now I'm hungry............
Just had a quick lunch break peekaboo and my site is back on-line. Was just a misinterpretation, not an issue to devote any further thought to! Now I'm hungry............Didn't you have the pong game .pdf on your web site?
Your new stuff is gone. Your current web site is an old backup....
Even your .pdf pong document in this thread's opening topic still says 'You account is still 'Suspended''... Try downloading it...
You probably need to re-upload everything changed over the past year...
I'd verify the contents of everything else just in case.
So says the evil overseer.