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Picture of Coin Radio: hacking a radio
 Coin Radio is a fun and exciting radio designed for children.  It is designed as a novelty way of interacting with the radio compared to the traditional radio design. The child will insert a coin into the top of the radio and watch the coin descend down to the bottom. When reaching the bottom the coin will turn the radio on.

                                                            
                
                                                           VIEW VIDEO BELOW TO SEE RADIO WORKING
                                                                                                    



 
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Step 1: Exploded isometric view

Part Number            Part title                                        Material                Process                     Quantity
1                              220x5mm side                              Acrylic plastic        Laser cut                        4 
2                               220x180mm front middle back    Acrylic plastic        Bandsaw                     3
3                               120x5mm slats                             Acrylic plastic        Laser cut                        4
4                               207x107mm top and bottom         Plywood                 Bandsaw                    2
5                               handle                                            Plywood                 Bandsaw                       1
6                               Grill                                                 Plywood                 Laser cut                        1
7                               scoop                                               Plywood           craft knife and glue          1
8                               Battery box with 2x1.5v batteries   -----------            --------------                      1
9                               107x50mm sides                           Plywood                 Bandsaw                     1
10                              220x50 front and back                  plywood            Bandsaw                        2
11                              6mm rods                                       plywood            Bandsaw                         2
12                              Dials                                                  metallic            Bought                            2
13                              140x5mm                                         Acrylic plastic      Laser cut                   1
14                               Speaker                                       --------------              ------------                     1

Step 2: Hacking a radio

Picture of Hacking a radio
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We started this project by being given a small portable sony radio. Simply taking the back and front off it left us with the circuit board speakers and ariel. For power it is easier to buy a small battery box suitbale to hold two 1.5Volt batteries. 

Step 3: Enhancing the circuit board

Picture of Enhancing the circuit board
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at this stage the circuit board should be fully detached from the original plastic casing. The next thing that should be done is attaching a micro switch between the battery box and the circuit to act as a switch when the coin hits it. when the coin hits the switch it will have to land in a bucket of some sorts so add a small shaped scoop onto the end on the micro controller switch for the coin to rest in.
When the coin lands on the scoop it will switch on the micro switch and in turn will complete the circuit and the radio will play. 
 

Step 4: Creating the base of the radio

Picture of Creating the base of the radio
For cutting out the wood for the base of the radio cut out the measurements bellow (measurements are in mm)

2X   (220x50) front and back

2X   (107x50) sides 

2X   (207x107) top and bottom

in one of the 220x50 cut out a rectangle (97x38) on the left hand side. this will now be the front

on one of the (207x107) cut 2 circles 6mm and 30 mm apart and create a slit on the left hand side of the wood big enough for a coin to fit through. This will now be the top

Step 5: Cut plastic

Picture of cut plastic
for the plastic on the top cut out. use clear acrylic plastic but the thickness does not matter. Mine was 5mm

3X (220x180) front middle and back 

4X (220x5)  sides

4x (120x5)  slats for coin to roll down 

1 x (150x 5) for the top between front and middle.

I used a laser cutter to cut out the shapes as it gave a smooth edge and precise cut but a band saw works just as well.  


Step 6: Cutting the grill for the front

Picture of cutting the grill for the front
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For the grill for the front of the radio cut a piece of thin plywood (100x 40) and cut holes into it as well for the sound to exit. 

I cut mine on the laser cutter for a precise finish. 

insert as many holes as you wish and what ever shapes you wish. 

this grill should now cover the  hole created in the wooden box 

Step 7: Glue plastic

Picture of glue plastic
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For this part of the process glue the 220x 5 onto  the left hand side of the 220x180 the other 220x5 onto the right. as an extra cut out a small semi circle in the top of the 220x5.

do the same again bar cutting the semi circle

then glue the two together. then on the front add the four 120 x 5 at angle so that the coin can roll down.  

Add the 150x5 to the top. then finish of by potting the last 220x180 on top to enclose it all.  

Step 8: Creating the box

Picture of Creating the box
gluing the wooden box together. Glue the top front and back and the right side at this stage. 

the other side will have to be left off till you fit a handle and the bottom cant be fitted till the circuit board is added to it. 

Step 9: Smoothing the plastic

using a flame i melted the plastic down on the edges to smooth off the edges.

Step 10: Attaching the plastic to the wood

Picture of attaching the plastic to the wood
glue the two together so that they fit securely and make sure the coin will drop down the hole. 

Step 11: Attach the circuit board

Picture of attach the circuit board
attach the circuit board to the to the top of the bottom piece of wood and slide up. attach 2 rods coming up from the volume and the tuning to act as dial. 

Step 12: Finishing off

Picture of finishing off
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add any dials you wish and create a lever for the side to open so you can remove the coin in turn turning the radio off.

Step 13: Final outcome

Picture of Final outcome
Radio should now be complete 

Enjoy ! 
stocky3 years ago
VERY NICE, if you added a relay on the power switch and made the switched (output leg) connect back to the input, you could make it so the coin dropped off of the lever and into a collection box but the radio would continue playing until power was switched off, this could be done using an "off" button on the front, this way it would be a good way of collecting money.
the collection box could sit below the radio and have a little padlock on a door on the side.
Just an idea

Great anyway:)
I can see this design to be used to create something along the lines of a 'Alarm clock that you have to put a coin in to turn off' It'd certainly help me save up!
but what if you ran out of change?
Thats when you throw it out the window !
Back in the 30s the landlords of some buildings had something similar but used clocks. In order for the tenants to keep the right time, they had to feed in the coins and then the landlord would come around every now and then to collect.
artworker3 years ago
This is soooo cool!