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The kid synth came about as I sat hunched over a tangled mess of synthesizer wires. My friend Oliver came over, assessed the situation, and said, "You...
Making a kid's toy proved to be an interesting design challenge. It not only had to be fun and inviting to a small child, but also virtually indestruc...
You will need: (x1) 24" x 36" x 1/4" maple plywood (x1) 6" x 6" x 1/16" acrylic (x9) Light dimmer knobs (white) (x2) Dreambaby Magnetic Locks (x1) Ra...
Download the attached file. Load a 2' x 3' x 1/4" piece of plywood into your (school's? friend's? local TechShop's?) laser cutter. Etch the template...
Solder the 76477 to the breakout board. Also, attach male header pins. This will help to easily attach the chip to a PCB.
The circuit is built around the 76477 sound generator chip. This chip was used in 1980s arcade machines, and a wide range of electronic toys. It has a...
Light dimmers are no longer simply large potentiometers that lower the voltage flowing through them. They actually have a whole bunch of circuitry to ...
Remove the potentiometer / power switch. Desoldering it is kind of a pain in the neck, so it is probably best just to cut it free. Connect the two en...
The light switch should have a few different mounting tabs. The only one we will need are the two threaded inner mounting holes. As a matter of cours...
Measure halfway across the shorter length of the mounting panel and make a mark (this should be at 2 - 5/16"). Repeat on the opposite edge, and then d...
Glue the bottom bracket to the inside of the bottom of the case such that the opening in the bracket is perfectly centered atop the hole in the bottom...
Mount the brackets for the magnetic latches to the bottom panel, flush with the narrow edge. These should be positioned so that they line up directly ...
Mount the circuit boards atop the appropriate spacers using wood screws. Mount the battery holder atop the battery holder bracket using a wood screw....
I decided to waterproof the speaker cone... just in case. It should remain waterproof so long as my nephew does not jab anything into the speaker gril...
While the case is not yet assembled, this would be a good time to prep the buttons for mounting. Install them in the front of the case, attach the co...
Position the potentiometers for the sequencer in the panel of the case and solder all of their common ground pins together with black wire. Position ...
Center the large round hole of the front panel bracket atop the speaker grill. An easy way to do this is to line up the smaller LED holes with the sm...
Affix the amp's speaker cone into the large opening of the front panel bracket using Fastbond 30-NF contact adhesive. Follow the directions on the lab...
Glue 1/4" spacers around the speaker cone such that they correspond with the amp's mounting holes. Place the amp board atop the spacers, and affix th...
Gluing the box needs to happen quickly and accurately. I started by lining up the four side pieces and made sure they fit properly with the top and bo...
First, let me say thank goodness for the belt sander in the wood shop at TechShop. This tool saved me a lot of time and frustration. Basically, I gen...
Put an even coat of polycrylic water-based sealant on all of the outer surfaces of the case (including the bottom panel). To get at all of the surfac...
I'm going to put this out here from the onset. Mounting the hardware in the front panel is extremely difficult and infuriating. It is very hard to get...
Plug your battery in and place it in the battery holder. If all went well, it should now be turned on and making noise. If it not turned on, try pul...
Most dimmer knobs are designed not to be interoperable. In other words, they all have annoying plastic notches in them which prevent them from being p...
To ensure the colored epoxy sticks well to the knobs sand the top surface and drill small shallow holes around the inner lip of the knob using a 1/64"...
Mix the epoxy at the ratio specified in a large batch. Pour this large batch into smaller mixing cups and then add pigment until the mixture is thoro...
Place the colored knobs onto the synthesizer's potentiometers as your see fit.
Opening the case is a little tricky on account of the magnetic locks, but not impossible. To do this, first unlock one with magnetic key and pull up ...
Roll over the text boxes on the graphics to see what each part is The metal power cord pull turns the synthesizer on and off. The speaker is where t...
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