# Audio Amplifier Kit - STA540

**Type:** Product page · **SKU:** KIT-09612 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/audio-amplifier-kit-sta540.html ([markdown](https://core-electronics.com.au/audio-amplifier-kit-sta540.html.md))

## Retired product

This product is retired and no longer available for purchase. Replaced by: ADA1752.

**Replacement:** https://core-electronics.com.au/catalog/product/view/sku/ADA1752

## Description

This is a stereo amplifier kit designed to make use of the [STA540](https://core-electronics.com.au/search/?q=009557) power amplifier IC. Once this kit is completed you have a fully functional, two-channel audio amplifier, complete with a standby switch, volume control and indicator LEDs. The kit also includes a 6400BG heatsink for the STA540 to dissipate any damaging heat.

 In this kit, the STA540 is configured as a dual bridge amplifier capable of delivering up to 2x 38W (4O at 18V). Power supplied to the kit directly powers the STA540 and should be within 8 to 22V.

 This kit comes as a bag of parts, you’ll need to solder everything to the PCB. All components are through-hole, so it shouldn’t be too difficult; but this kit is a bit more complex than our other through-hole kits.

**Kit Includes:**

- 1x STA540 Audio Amplifier Kit PCB
- 1x [STA540 Dual/Quad Power Amplifier](https://core-electronics.com.au/search/?q=009557)
- 1x [6400BG Heatsink](https://core-electronics.com.au/search/?q=09576)
- 1x [LM358 Op Amp](https://core-electronics.com.au/search/?q=09456)
- 3x [LED - Basic Red](https://core-electronics.com.au/search/?q=00533)
- 1x [SPDT Mini Power Switch](https://core-electronics.com.au/search/?q=00102)
- Resistors: 
    - 5x 10K Ohm
    - 3x 1.0K Ohm
    - 2x 47k Ohm
    - 2x 100k Ohm
    - 2x 10k Giant Trimpot
- Capacitors: 
    - 1x 0.1uF-50V-20%
    - 1x 100uF - 25V
    - 4x 0.47uF-25V
    - 2x 10pF - 200V - 5%
    - 3x 1uF - 50V - -20,+80%
    - 1x 1000uF/25V
- 5x 2-Pin Screw Terminal - 3.5mm
- 4x Nylon Round Female Standoff
- 5x Phillips Screw with 4-40 Thread
- 1x #4-40 Hex Nut
 
**Documents:**

- [Schematic](https://core-electronics.com.au/attachments/localcontent/STA540AudioAmpv11_27647719786.pdf)
- [Eagle Files](https://core-electronics.com.au/attachments/localcontent/STA540AudioAmpv11_36897c97c71.zip)
- [Assembly Instructions](https://core-electronics.com.au/attachments/localcontent/SFE03-0010-KitCard-AudioAmp-ReadersSpreads_03_316993c4e0a.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/a/u/audio_amplifier_kit_-_sta540__kit-09612__01.jpg)