Yess… One more classic gadget added to my classic collections - ‘National Tape Recorder’. Accidentally I got this from shop near my house, shop man having habit of listening radio and having 4-5 other radios in his store room but all were not working. I bought this for 50 rupees, it was full of dirt-covered and i was not sure whether can be restored its functions or not. But one thing I really appreciated the make National because except speaker and AC power socket, rest everything was working properly.
Now I wanted to restore it and use it every day to listen music. Initially I replaced speaker and power socket. And to access digital audio files I added USB access module to the tape recorder. I have attached pdf file for the wiring and circuit diagram.
1. USB MP3 player main board
2. USB socket
3. Tactile switches - 4
4. Audio socket)
5. Slide switch
6. Copper bread board
8. Chrome vinyl film
9. Fast gum
10. Piece of foam board
11. Dirt cleaning solution
12. 4" Loud speaker
13. AC power plug socket
1. IC - 7805
2. Capacitor - 220mf/50v - Electrolyte
3. .Capacitor -01mf - Ceramic
1. Soldering gun
4. Craft knife
5. Steel ruler
Check it out.
Step 1: National Tape Recorder
This was the condition when i bought it from shop man.
Step 2: VIRE usb mp3 player module
VIRE usb mp3 player board cost Rs140/-
Step 3: MP3 player board/display mount
After making mark for the display size started with holes, and shaped it according to display dimension using craft knife.
Step 4: Making Control Panel
Step 5: Cassette / USB option switch
Step 6: Circuit, USB/ AUX provision and IR sensor
Step 7: 5V regulated power supply circuit
5V regulated power supply circuit for VIRE USB MP3 board
IC - 7805, Capacitor - 220mf/50v and .01mf
Step 8: Wiring
Even to play from the usb, play button in the cassette mechanism should kept pressed, just need to slide the USB/Cassette button to USB mode.
Step 9: Chrome vinyl sticking
Sticking chrome vinyl on the spoiled panel
Step 10: Finally my Music Box
Finally my Music Box and Circuit Schematic.
Step 11: Some more pics