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- This bulletin has been taken from the OSUNY files from 82/83
- PLEASE NOTE THAT THIS BULLETIN IS FOR INFORMATION PURPOSES
- ONLY AND YOU SHOULD NOT ATTEMPT TO BUILD THIS DEVICE FOR
- USE IN ANY FRAUDULENT OR ILLEGAL ACT.
-
- M R. AMERICA
-
- KEY
- ===
-
-
- First a few KEYS to the diagram:
-
- Cx is capacitor #x Denoted by: ---| |---
-
- Px is Pot or Variable resistor #x Denoted by :/
- \
- /<--
- \
- Rx is resistor #x Denoted by /\/\/\/\
-
- SCHEMATICS
- ==========
-
- The XR-2207 chip is a Voltage-Contr olled Oscillator and a 14
- pin device thu s you must be very careful when soldering
- the parts to this device. It is a little dificult to actually draw a
- schematic on a 80 character scren using limited gra phics but will
- give it a try.
-
- TO GND_____________
- |
- ___
- C2 C3 ___
- _||_ |
- | | _____|__9v+
- | | | |
- ` ` ` ` ` ` ` |
- ---------------- --------------- |
- |7 6 5 4 3 2 1 | |
- | < |
- |8 9 10 11 12 13 14| |
- ---------------- --------------- |
- ` ` ` ` ` ` ` |
- | | |
- --| |--------| | |
- |C1 R2 | R1 |
- GND ______|___/\/\/\/\______|_ ____/\/\/\/\______|
-
-
- This is a diagram of how to locate the different pins on the chip please
- no tice that pin one is the closest to the n otch on top of the chip. The
- first thing we'll do is to connect power to the chip (remember that you
- need to build two of these to get a complete system) this is accomplished by
- connecting the positive wire of the battery lead to pin 1 one leg of R1 and R2
- is solder to pin 11 the other leg of R1 goes to pin 1 or to the positive of
- the battery. The other leg of R2 goes to ground, C1 goes between pin 10
- and ground.
- The timing capacitor or C2 goes between pins 2 and 3 of the chip
- pins 8 and 9 should be grounded to ground. Pin 14 is the output
- and this is where one leg of C4 (C3 goes on the other VCO) in series with
- R3(the same goes for the other VCO) and to one lead of the speaker.
-
-
- The trimmer pots P1 to P10 should be grouped in groups of 5 pots each
- . the way you group it is by soldering one end of the pot to each other
- leaving the wiper and the other end free.
-
- | This end goes to pin 6 of the chip
- |
- _____________|_____________
- / / / / /
- \ \ \ \ \
- /<- /<- /<- /<- /<-
- \ | \ | \ | \ | \ |
- / | / | / | / | / |
- | | | | |
- | | | | |
- P1 P2 P3 P4 P5
-
-
- And finally this is the way each key should be wired.
-
-
- diode
- to Px ------>|-----| This is the contact of the
- |--------- \------ key
- to Px ------>|-----| |
- diode |
- -----
- --- Ground
- -
-
-
-
- This may not be the best way to show the schematics but at least it is
- something.
-
-
- MR. AMERICA
-
-
- NOTE: This is for information ONLY please do not break any laws.
- Please direct any questions to the SYSOP or to Mr. America.