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
- 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