> **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

# Medium Surface Transducer with Wires - 4 Ohm 3 Watt

**Type:** Product page · **SKU:** ADA1785 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/medium-surface-transducer-with-wires-4-ohm-3-watt.html ([markdown](https://core-electronics.com.au/medium-surface-transducer-with-wires-4-ohm-3-watt.html.md))

Turn any surface/wall/table etc into a speaker with a surface transducer. This type of speaker does not have a moving cone like most speakers you've seen. Instead...

## Pricing

- **Price:** $28.20 (inc GST) — $25.64 AUD, exc GST
- **Quantity discounts:** 10+ $24.86 (exc GST) · 50+ $24.35 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today, and up to 500 more in 8–12 days.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA1785:1` (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/ADA1785:1.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

Turn any surface/wall/table etc into a speaker with a surface transducer. This type of speaker does not have a moving cone like most speakers you've seen. Instead, a small metal rod is wrapped with the voice coil. When current is pulsed through the coil, the magnetic field causes a piece of metal to expand and contract - and if it's pressed against a surface it turns the transducer into a speaker!

Often these size transducers are pressed up against a flat surface to turn it into a sounding board. The effect is a surprisingly clear sound that comes from the surface itself. The body of the transducer is heavy so that it can be placed with the top down on a table. And for another fun trick, put the transducer at the end of a large plastic cup to point sound in a particular direction.

This transducer is about 28mm in diameter and has 4Ω impedence and should be run at about 3W. It pairs great with any of our audio amps such as the [TS2012 breakout](https://core-electronics.com.au/stereo-2-8w-class-d-audio-amplifier-ts2012.html) or [MAX98306](https://core-electronics.com.au/stereo-3-7w-class-d-audio-amplifier-max98306.html). Just connect it as you would any other speaker, we even have some wires pre-soldered on.

### Technical Details

**Revision History:**

- **As of Dec 19, 2023 -** The design of the Medium Surface Transducer has been updated, the previous design is no longer available but this one has equivalent functionality. The transducer no longer comes with wires already attached but does come with 3M double-sided tape on the bottom to help with mounting to any flat surface.
 
- **As of July 10, 2018 -** This transducer no longer has a rubber pad on the transducing element.

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/1/7/1785-06.jpg)