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Project Notes

#359 HS088 Audio Effects Chip

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


Here’s a quick demo…



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.



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



Credits and References

About LEAP#359 AudioMusic Chips
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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!).

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