Instructables
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. 
 
stocky2 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.
artworker2 years ago
This is soooo cool!