> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Sound Detector

**Type:** Product page · **SKU:** SEN-12642 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/sound-detector.html ([markdown](https://core-electronics.com.au/sound-detector.html.md))

The Sound Detector is a small and very easy to use audio sensing board with three different outputs. The Sound Detector not only provides an audio output, but also a binary indication of the presence of sound, and an analog representation of its amplitude. The 3 outputs are simultaneous and independent, so you can use as many or as few as you want at once.

## Pricing

- **Price:** $20.85 (inc GST) — $18.95 AUD, exc GST
- **Quantity discounts:** 5+ $18.38 (exc GST) · 25+ $18.01 (exc GST) · 100+ $17.25 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today, and up to 100 more in 5–11 days.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=SEN-12642:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/SEN-12642:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

The Sound Detector is a small and very easy to use audio sensing board with three different outputs. The Sound Detector not only provides an audio output, but also a binary indication of the presence of sound, and an analog representation of its amplitude. The 3 outputs are simultaneous and independent, so you can use as many or as few as you want at once.

The envelope output allows you to easily read amplitude of sound by simply measuring the analog voltage. Gain can be adjusted with a through-hole resistor, to change the threshold of the binary (gate) output pin as well. Check the hookup guide below for more information about setting gain.

Each of the three output signals is present on the 2.54mm header at the edge of the board. They are active simultaneously. If you aren't using one in your particular application, simply leave that pin disconnected.

## Documents

- [Schematic](https://core-electronics.com.au/attachments/localcontent/sound-detector_56524d13f9c.pdf)
- [Eagle Files](https://core-electronics.com.au/attachments/localcontent/sound-detector_72604d7fe8e.zip)
- [Datasheet](https://core-electronics.com.au/attachments/localcontent/LMV324_12812e26538.pdf) (LMV324)
- [Hookup Guide](https://learn.sparkfun.com/tutorials/sound-detector-hookup-guide)
- [GitHub](https://github.com/sparkfun/Sound_Detector) (Design Files)
- [Product Video](https://www.sparkfun.com/videos#all/E4L8bYt6lCs/190)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/s/o/sound_detector__sen-12642__01.jpg)