Synthesis on a chip (CMOS Hex Schmitt Trigger Integrated Circuit )
items used in my task
- A plastic prototyping board
- 1 CMOS Hex Schmitt Trigger Integrated Circuit
- 100k resistor
- 0.1uf capacitor
- 1ook pot x2
- 100k light sensitive resistor x2
- 2 way gate switch
- Optional: Some small signal diodes, such as 1N914,
- hookup wire.
- A 9-volt battery and connector
- mini jack mono
First I placed the chip onto the breadboard making sure that chip sat across the central divider of the board as show below. I then connected the positive and negative buss to a 9v battery.
I then connected pin 7 to the ground and pin 14 to the positive bus. Also bridging the positive bus so that it runs the whole way across(negative does already)
Between pin 1 and ground the 0.1uf capacitor is placed. This will determine the range of pitches available when resistors are added.
then add a 100k resistor between pins 1 and 2.
pin 2 and ground are connected to the headphones or choice of amplification. I at first soldered two crocodile clips two jumper cables to I could amplify the circuit.
this is the basic circuit now working. (should have audio at this point)
MODIFICATIONS
Pitch
the firsts modification was to be able to modulate pitch. So I replaced the 1ook resistor with a 100k pot.
Amp
I then added a 100k light sensitive resistor at the end of the circuit before going to the speaker to control amplitude.
I then replaced the light sensor which was controlling amplitude with a 100k pot, and put a two way switch in so that pitch could be controlled ever with a 100k pot, or the light sensor.
I then connected to jumper cables to a mono jack cable so that I could amplify or record the circuit.
ALL AUDIO WILL BE COMPLIED INTO ONE LABELED DEMO AT THE END
Now my circuit was set up I experimented further for example experimenting with changing the capacitor to a 1uf and 100 Electrolytic capacitor.
I also experimented with using random objects as the resistor. One that worked effectively was a drink can, connecting the lid to one cable and holding the other, so your body is the resistor. depending on how many figures you hold down it changes the resistance, in this case for pitch. I also noticed how the thumb has the least resistance as it has a major vain in it.
Audio examples will be added soon
