#Synth 76477 how to#
#Synth 76477 generator#
#Synth 76477 series#
#Synth 76477 free#

#Synth 76477 series#

When you change the position of each of the sequencer's knobs, it changes the voltage the 76477 chip receives on pin 16, and this in turn changes the output frequency of the audio note.ДЄlso, between the 4017 step sequencer circuit and 46477 chip are a series of 8 arcade buttons. This can be sped up and slowed down with a potentiometer.

The timing for the decade counter is being controlled by a 555 timer chip. The VCO on the chip is largely being controlled by a series of four potentiometers that are being stepped through in sequence by a 4017 decade counter.

#Synth 76477 free#

If you are building this for yourself and not a one year old, feel free to mess around with circuit and experiment. However, my goal here was to keep feedback very direct, so I hardwired a lot of the more vague settings a person may want to adjust on the fly (such as note attack and decay). Since this chip is doing so much, it has a lot of potential to be controlled with external circuitry. It has a built in VCO (voltage controlled oscillator), envelope generator, noise generator, signal mixer, and amp. This chip was used in 1980s arcade machines, and a wide range of electronic toys.

#Synth 76477 generator#

The circuit is built around the 76477 sound generator chip. (x1) A bunch of random tools (and whatnot) (x1) Resin measuring cups and mixing sticks (need many) (x8) Light toggle switches (4 white - 4 black) (x8) SPDT arcade button switches ( assorted colors) (x1) Radioshack Mini Amplifier ( #277-1008C) This toy is compelling to children of all ages. This makes it fun enough for a toddler to wail away on, but complex enough that it will still be rewarding as he gets older. While some knobs may not work when some of the switches are toggled, my nephew will never be far from making it create some sort of noise, or toggling it back into some sort of highly playable state. I did, however, water seal speaker cone, because - well - you never know.Д«eyond that, I simplified the synthesizer circuit that I was working with to only include functionality that gave immediate or near immediate feedback. I'm just hopeful he won't try to jab anything long and skinny inside the holes. I considered reinforcing this with a metal mesh, but ultimately decided against it. The one weak point in the case is the speaker grill. This makes the case both seamless, and easily accessible (to those in the know). In order to get into the inside of the case, you need to know to carefully place a magnet on two specific places on the hatch. I resolved to use a hatch system with two child-proof magnetic latches. I didn't want him to be able to get into the case and tug at the wiring.

#Synth 76477 how to#

One more thing I had to keep in mind was how to make changing the battery easy enough my sister could do it, but impossible for my nephew. Toddler testing thus far has proven successful.

I resolved upon a lamp pull switch for this task. I wanted it to be easy enough that my nephew could feasibly use it himself, but difficult enough that he would not get the immediate feedback of turning the synthesizer on and off repeatedly (which would defeat the point of all other switches). I solved this problem by adding colored resin to the tops of each of the knobs. Unfortunately, they were not very colorful and inviting. From my experience, I find that small children like to play with light switches and other big buttons. I next decided to replace the switches, sliders, and potentiometer knobs with home lighting fixture parts. I tested this theory on the Instructables resident toddler and she seemed more than pleased to smash away at the button panel, whether or not the buttons did anything. This meant that I had to minimize the amount of detachable parts, and make it difficult for a child to take apart.ДЇor starters, I decided to use big colorful arcade buttons because of their sturdy construction and inviting appearance. It not only had to be fun and inviting to a small child, but also virtually indestructible and safe to play with. Making a kid's toy proved to be an interesting design challenge.