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Project Notes

#359 AudioEffectsChips/HS088

Figuring out the HS-088 “Ding Dong” audio effects chip.

Build

Here’s a quick demo…

Build

Notes

The HS-088 chip produces a typical electronic doorbell “ding-dong”, which repeats three times when triggered. It is very similar to - and not any more pleasant! - than the kind of effect you can get with common 555 circuits like LEAP#059 TwoToneDoorbell.

HS088_chip

Circuit

The chip requires a few external components:

  • 3-4.5 V power supply
  • a small signal NPN transistor such as the S8050
  • 8Ω speaker
  • switch
  • a 100nF capacitor (104)
  • a pull-down-resistor e.g. 10kΩ

A few things to note:

  • most schematics available around the web do not include the pull-down resistor. I found that without this, the effect could be triggered only once and would not reset.
  • the output volume is very low. It seems it would need additional amplification to be useful

Schematic

Build

Credits and References

About LEAP#359 AudioMusic Chips
Project Source on GitHub Return to the LEAP Catalog

This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.