#521 CK9561 Audio Effects Chip
Figuring out how to use the CK9561 music chip with 4 sound effects - alarm/siren/weapon sounds that sound strangely familiar if you have ever walked through a toy department at Christmas!
Here’s a quick demo..
Notes
The CK9561 is the latest in a series of music effects chips I’ve been testing. The CK9561 is sometimes labelled KD9561 of XK9561 - I presume these are just different manufacturer’s names for boards based on the same chip.
The module,with pins attached for testing on a breadboard:
Usage and Schematic
The chip requires just a few external components to operate:
- the resistor (100kΩ-390kΩ) controls the speed of the effect - higher resistance slows the effect down
- a small signal NPN transistor (I used a 2N3904) for controlling the speaker
- and switches - not shown in the schematic below:
- the effect is “always on”, so a switch in the power line can be used for on/off control
- switching connections “1” and “2” between unconnected/pulled-low/pulled-high select from the range of sound effects according to the following table
| Pad 1 | Pad 2 | Effect |
|---|---|---|
| n/c | n/c | alarm |
| high | n/c or low | fire alarm |
| low | n/c | ambulance |
| any | high | machine gun |
Testing on a breadboard:
I also added the chip to one of my “audio effects” copper-clad test boards. I’ve added a few components:
- resistor is 100kΩ fixed + 200kΩ variable resistor
- mini push-button switch on the power connection (effect on/off)
- a 3-position switch for toggling pad 1 between unconnected/pulled-low/pulled-high
- mini push-button switch on pad 2
- external 8Ω speaker
Credits and References
- KD9561 CK9561 Alarm Module - from a seller on aliexpress
- 2N3904 datasheet