Amazing. In 1987 I made a gift for my fiancee (then) by building a melody box using this UM3482A chip. We just found that in our collection box. It is not working. Appreciate if you can help in troubleshooting this little circuit. I am totally out of touch with such stuff but we both are exited to find your video and thought that we may be able salvage it. Thank you. Krishna
Those sounds like in the last part... no, not at all like C64 or Atari. But i have heard them sometimes employed on ZX Spectrum and in something like... watch circuits? game-and-watch clones? What the chip really needs to sound genuinely pleasant is a sawtooth generator, where you integrate the signal over time and reset it on the edge. Sawtooth has a faster decay than pulse wave but it includes even and odd harmonics, rather than the pulse wave consisting only off the odd harmonics. Additionally some lowpass filter with resonance won't hurt.
Ideas for further experiments are always sought after. Thanks for your comments! My Atari 2600 is sitting about 10 feet from me, maybe I need to hook it up again.
Recently I started messing around with discrete IC’s and digital logic IC’s to create an LED multiplexer. Finally got my circuit working in SPICE, now to build it and see if it actually works. I wanted to avoid using a MCU for this project and use off the shelve components. The final circuit will have ~200 LED’s being multiplexed and driven by the digital IC’s.
Thankfully I have used the frequency phase shifting I’m using before so I know that works. Planning to build the multiplexing the circuit, maybe do a PCB for it and testing that before building the whole thing with LED’s.
I own a Nichols Electronics Digital II ice cream truck music chime box, and it has 8 songs on it. I'm pretty sure it uses this same chip because the pitch/speed adjustment you mentioned at 2:12 is done through an internal pot located inside of the chime box itself. It uses a square wave synth chime as well, but that's all I know about it. I have videos on my channel of my box, and I am going to post a video showing how to change the pitch/speed on it soon Cool video by the way. Nichols also used this chip on the now discontinued Omni music box, witch had 32 songs divided into two channels of 16 songs each.
I have either that or something similar in the same family on order from Aliexpress. I never had one back in the day but I recently found out about it.
U need to use 2 transistor circuit (not low-cost application circuit with 1 transistor) to emulate 3 instruments. th-cam.com/video/9HdTrDh_wts/w-d-xo.html
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Thank you! Very interesting. I just received a UM3482A chip in a lot of Radio Shack parts. So, this takes it up a level or two!
Incredibly interesting! Very nice channel, subscribing now!
That's clever how you modified the sound, but if I heard that music when I was on hold on the telephone, I would probably not be happy.😄
Amazing. In 1987 I made a gift for my fiancee (then) by building a melody box using this UM3482A chip. We just found that in our collection box. It is not working. Appreciate if you can help in troubleshooting this little circuit. I am totally out of touch with such stuff but we both are exited to find your video and thought that we may be able salvage it. Thank you.
Krishna
How can I share the picture of circuit board we have?
Like what you're doing there! I used to fiddle (no pun) with stuff like that! Divided it down. Cool!
Yes pun.
👍
Those sounds like in the last part... no, not at all like C64 or Atari. But i have heard them sometimes employed on ZX Spectrum and in something like... watch circuits? game-and-watch clones?
What the chip really needs to sound genuinely pleasant is a sawtooth generator, where you integrate the signal over time and reset it on the edge. Sawtooth has a faster decay than pulse wave but it includes even and odd harmonics, rather than the pulse wave consisting only off the odd harmonics. Additionally some lowpass filter with resonance won't hurt.
Ideas for further experiments are always sought after. Thanks for your comments! My Atari 2600 is sitting about 10 feet from me, maybe I need to hook it up again.
Recently I started messing around with discrete IC’s and digital logic IC’s to create an LED multiplexer. Finally got my circuit working in SPICE, now to build it and see if it actually works. I wanted to avoid using a MCU for this project and use off the shelve components.
The final circuit will have ~200 LED’s being multiplexed and driven by the digital IC’s.
Hopefully you can build it in smaller sections for testing before building something that big in case there’s any wiring mistakes.
Thankfully I have used the frequency phase shifting I’m using before so I know that works. Planning to build the multiplexing the circuit, maybe do a PCB for it and testing that before building the whole thing with LED’s.
I own a Nichols Electronics Digital II ice cream truck music chime box, and it has 8 songs on it. I'm pretty sure it uses this same chip because the pitch/speed adjustment you mentioned at 2:12 is done through an internal pot located inside of the chime box itself. It uses a square wave synth chime as well, but that's all I know about it. I have videos on my channel of my box, and I am going to post a video showing how to change the pitch/speed on it soon Cool video by the way. Nichols also used this chip on the now discontinued Omni music box, witch had 32 songs divided into two channels of 16 songs each.
It doesn't use a UM3482A. But there are other melody ICs that have oscillation.
I wonder how that audio is programmed into it? Some sort of direct-to-silicon ROM array?
I think the data sheet said masked ROM so it was just part of the structure.
I messed with the SN76488N I think it was back in the 80's. I may still have it somewhere.
I have either that or something similar in the same family on order from Aliexpress. I never had one back in the day but I recently found out about it.
Thanks for helping me understand this stuff. :) I got a video coming up I think you are going to like. :)
The Melody Generator could be used as part of a door bell!
If I could do the video over again, I would hack into my doorbell and make it run this circuit for a laugh.
You can attach that to an ice cream truck driven by Pennywise (clown from the movie It). Trick or Treat!? =o
U need to use 2 transistor circuit (not low-cost application circuit with 1 transistor) to emulate 3 instruments.
th-cam.com/video/9HdTrDh_wts/w-d-xo.html
Multi instrument tones come from pins 10 and 11 and pin 9 as used in low-cost application only sends just beeps.