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Electronic Projects and some archaic chips Your browser does not support the video tag. The SN making some noise. Its VCO is being externally controlled by a sequencer. Most of the projects on this page are in progress. The SN is almost done here. I still have to get started on the SN on the left. There are schematics for any circuits like these I could find, or links to other pages related directly to any of the chips found on this page.
Some of my circuits are combinations of one or more other schematics I found online and put together. I really do hope that the 12 people left in the world that care about these chips find what they need though.
I made the demonstration circuit when I was about 16, and when I was about 18 I destroyed it trying to connect it to all of my other sound making devices. None of those devices have survived to this day, with the exception of one or two of the chips. Incidentally, based on schematics from Popular Electronics circa , I recently built a summing amplifier and power supply which would have allowed my to mix all of these things and probably not destroy all of my stuff back in the day.
Circuits for this chip can be found in the Engineers Notebook edition, the "SN Article Reprint", and May Popular Electronics pg 77 , all of which can be found in the links to the left. As time progresses, both of these chips will be used for something, and I currently have everything I need to build the original demo unit x2.
There are links in the left-hand column to a few projects using these chips. What does it do? It makes noise! Wonderfully basic noise. I first saw this chip in the Radio Shack Engineers Notebook, edition. They are very different, with the SNN having more external controls and external amplifier.
Pay attention if you are replacing an SNN in a schematic! It also has an audio input for mixing other similar devices. The NF is a small fat chip with 1.
I had to build adapter boards because I bought two of the wrong size. The incorrect schematic was fixed in the Radio Shack Engineers Notebook, edition in the links to the left , and that schematic has been tested and works fine. Some of these chips for sale on E-bay are already soldered to an adapter board, so choose wisely when purchasing. After searching for quite a while, I found several good articles about the SN chip.
I adjusted the oneshot and VCO circuitry to match the sn demo schematic. There is also a great article in CineMagic Issue 18 from , also in the links to the left.
The writer explains how even though the datasheet is bad it still has some good info. He also explains how the build in that article is version two of the build from CineMagic Issue 14, from , again, in the links to the left.
I find it interesting that when I bought my first two chips, they were in the clearance bin at Radio Shack, and even though they had staples where the datasheets should have been, there were no datasheets attached. I wonder if they were removed intentionally because people were toasting their chips? A partially soldered board for the SN It still makes wonderful noises, but the SN has fewer oscillators and no direct envelope modification. Something that seems to have been missed elsewhere is that this chip DOES have voltage controlled volume, which can certainly be used as envelope modification.
An enclosure for the SN Some of the jacks are still not functional. A rear view of the enclosure. If I were making another one of these, I would have arranged things a bit differently.
I have finished my basic build and enclosure, and am not disappointed with the results. The VCO can be externally controlled, and so can the "envelope" by means of external volume control, which also works as expected. Check out the videos. I really need more control devices keyboards, sequencers, etc. It just might surprise me more than it already has.
These chips are not readily available any more and I only have one chip, so I tried to make the most out of it by designing my circuit carefully, adding connection points in places that might be useful later. Your browser does not support the video tag. I am putting this on the back burner now to finish the sequencer.
Once the sequencer is complete, it will be much more fun to play with this box, at least. I gotta say, this stuff is getting pretty Devo. Trying to route the wires from the board. The case was point to point wired, meaning it was soldered after the components were mounted.
CD 2x8 or 1x16 Sequencer This is the simplest sequencer layout I could find that did what I wanted. Sure, there are lots of wires, but not too many other parts. There are tons of schematics out there, but the one I used is here. The LEDs and potentiometer layout is straight from the Baby 10 sequencer schematic. The clock circuit is a simple oscillator followed by a J-K flip-flop for easy frequency division. Portamento or Glide A simple CV step sequencer is nice, but sometimes you just want a bit more.
This circuit adds portamento or glide to the CV output of the sequencer. Basically it adjusts the voltages between steps, and you can change how quickly this adjustment happens. I found this schematic on electromusic. It is very basic, but does the trick. I adjusted values for the variable resistor and the capacitor. Minimal parts and lots of functionality. A clock circuit is a pretty important piece of a sequencer and other synthesizer modules. In the case of the sequencer, it is the "heartbeat", or the thing that actually makes the steps progress.
The clock circuit that I built is about as simple as it gets. Pulse width modulation is possible with a potentiometer, and the frequency range is pretty wide. For something like a sequencer, there are reasonable limits that you want to enforce. Clock pulses slower than 30 seconds would probably be useless when making music but who knows? On the other hand, if you use a very high frequency clock rate, it is actually posible to create a waveshape as the output of your sequencer, which you could use elsewhere in your synth chain.
The Audio Artist Your browser does not support the video tag. Here is the "Audio Artist" making some noise. This is from Popular Electronics, Dec I first built an Audio Artist back in or so, with some help from my dad.
In fact, I think he did most of the grunt work, and I just happily soldered away. It was originally in Popular Electronics December, edition , Which can be found in the links to the left. Popular Electronics has "Letters to the Editor", as well as a section called "Out of Tune" for corrections to articles and circuits, and I found two corrections in there.
Without the first correction, which is a missing trace on the PCB, the circuit sounds aweful, but it does make noise. Once you fix that trace, it makes a much nicer noise. Here are the guts of the Audio Artist. This was a pretty simple build. The board is from an old VCR. For example, some synthesizers operate on 15v, and may need both positive and negative voltages. Where do you get a power supply that can do all of these things?
What did I do? I used the power supply board from an old VCR! That single board has 5v and 12v outputs, all usable at the same time. Eventually I needed more than what the VCR power board could provide, so I ended up building a power supply of my own. It is based on an article in Popular Elecronics.
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SN76477N DATASHEET PDF DOWNLOAD
Electronic Projects and some archaic chips Your browser does not support the video tag. The SN making some noise. Its VCO is being externally controlled by a sequencer. Most of the projects on this page are in progress.
At each stage, the process can be controlled at the programming inputs of the signal modification and generation circuits, using control voltages, logic levels, or different resistor and capacitor values. The SNN was in a standard 0. The SNNF was in a less common 0. SN top view A redraw of a demonstration circuit used to try out most of the capabilities of the sound chip The text below is intended to explain the use of the in the demo circuit shown at the right. SW1 is a five position rotary switch that selects which capacitor controls the one-shot circuit that sets the envelope timing. SW24 toggle or momentary is the one-shot trigger switch, closed position is active.