Nuts and Volts - February 2011

AUDIO AMPLIFIER KITS

"The Champ" Audio Amplifier KC-5152 $6.00 plus postage & packing This tiny module uses the LM386 audio IC, and will deliver 0.5W into 8 ohms from a 9 volt supply making it ideal for all those basic audio projects. It features variable gain, will happily run from 4-12VDC and is smaller than a 9 volt battery, allowing it to fit into the tightest of spaces.

50 Watt Amplifier Module KC-5150 $22.00 plus postage & packing This 50 watt unit uses a single chip module and provides 50WRMS 8 ohms with very low distortion. PC Board and electronic components supplied. PC Board size only 84 x 58mm. Requires heatsink. See website for full specs.

• Heatsink to suit HH-8590 $12.50

Universal Stereo Preamplifier KC-5159 $12.50 plus postage & packing

Based around the low noise LM833 dual op-amp IC, this preamp is designed for use with a magnetic cartridge, cassette deck or dynamic microphone. The performance of this design is far better than most preamps in many stereo amplifiers, making it a worthy replacement if your current preamp falls short of expectation. It features RIAA/IEC equalization, and is supplied with all components to build either the phono, tape or microphone version.

• Measuring only 80x78x30mm, it is ideal for incorporating into existing equipment and is hence supplied short form of PCB and specified components plus PCB standoffs for mounting.

• +/- 15VDC required, use KC-5038 $11.00.

• If power is not available in your equipment use MM-2007 $5.50.

KC-5495 $32.75 plus postage & packing

An ideal project for anyone wanting a compact and portable stereo amp where 12V power is available. No mains voltages, so it's safe as a beginner's first amp. Performance is excellent with 20WRMS per channel at 14.4V into 4 ohms and THD of less than

0.03%. Shortform kit only.

• Kit includes PCB & on-board electronic components • 12VDC • Recommended heatsink Cat No. HH-8570 $4.50

HIGH PERFORMANCE 12V STEREO AMPLIFIER

• PCB and all electronic components included

"Pre-Champ" Versatile Preamplifier KC-5166 $6.50 plus postage & packing

This tiny preamp was specifically designed to be used with the 'Champ' amplifier KC-5152. Unless you have a signal of sufficient amplitude the 'Champ' will not produce its maximum power output. The 'Pre-Champ' is the answer with a gain in excess of 40dB, which is more than enough for most applications. You can vary the gain by changing a resistor and there is even provision on the PCB for an electret microphone. Use AM-4010 $2.00.

CLIFFORD THE CRICKET

KC-5178 $12.50 plus postage & packing

Clifford is created on a small PCB, measuring just 40 x 35mm and has cute little LED insect eyes that flash as it sings. Just like a real cricket, it waits a few seconds after darkness until it begins chirping, and stops instantly when a light comes back on.

• PCB, piezo buzzer, LDR plus all electronic components supplied • Power requirement 6-12VDC.

THE SUPER EAR

KIT OF THE MONTH Hearing Loop Receiver Kit

KC-5497 $22.00 plus postage & packing

A hearing loop is an inductive assisted listening system for the hearing impaired. They're typically installed in venues such as churches and conference rooms to enable listeners to receive in-ear communication via a wireless induction loop. You can now install this technology on your own TV, home theatre or hi-fi system. This will enable someone who's hard of hearing to hear at their own volume level without having to turn the volume up to a level too high for everyone else. The receiver will drive a pair of headphone or earbuds from the signal picked up from the hearing loop. The whole unit is completely self-contained and can be carried around in a pocket or you can add your own belt clip, so the user isn't constrained by a set of headphone leads. The kit is complete with case, • Current consumption: 10mA • Frequency response: 100Hz - 5kHz • S/N ratio: 67dB •

Battery voltage indication: Down to 7V

KC-5469 $20.25 plus postage & packing

Enables you to run a stereo amplifier in

'Bridged Mode' to effectively double the power available to drive a single speaker. There are no modifications required on the amplifier and the signal processing is done by this clever kit. Supplied with silk screened PCB and components. Requires balanced (+/-) power supply.

• PCB: 103 x 85mm

BRIDGE MODE ADAPTOR FOR STEREO AMPLIFIER

KA-1809 $20.25 plus postage & packing Assists people who have difficulty hearing high audio frequencies, or use as an interesting education aid in the classroom. By amplifying high audio frequencies, conversations will be made clearer and you will hear sounds not normally heard such as insects or a watch ticking. Kit supplied with case, processed panels, PCB, 9V battery, and all electronic components. Headphones required.

• PCB: 56 x 26mm Note: Not a replacement for a proper hearing aid.

"MINIVOX" VOICE OPERATED RELAY

KC-5172 $12.00 plus postage & packing Voice operated relays are used for 'hands free' radio communications and some PA applications etc. Instead of pushing a button, this device is activated by the sound of a voice. This tiny kit fits in the tightest spaces and has almost no turn-on delay. 12VDC 35mA required. Kit is supplied with PCB, electret mic, and all specified components.

• PCB: 47 x 44mm

KG-9092 $9.50 plus postage & packing

This kit generates a deep sounding noise similar to fog horns on ships. Use as a unique warning siren or to improve a child’s toy. Operating voltage is 4.5V to 12VDC. Output power up to 5 watts depending on the input voltage used. Requires an 8 ohm speaker.

FOG HORN

Order Value Cost $25 - $49.99 $7.50 $50 - $99.99 $20 $100 - $199.99 $40 $200 - $499.99 $60 $500+ $75

Note: Products are dispatched from Australia, so local customs duty & taxes may apply.

Prices valid until 28/2/2011

POST & PACKING CHARGES

Max weight 12lb (5kg).

Heavier parcels POA.

Minimum order $25.

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HOW TO ORDER

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Miniature FM Transmitter KE-4711 $9.75 plus postage & packing This unit is a two transistor two stage transmitter that has the benefits of being VERY COMPACT. Kit contains PCB, 9V battery and all components, and makes an ideal, inexpensive beginners kit.

• PCB - 45 x 22mm • 9VDC 100-200MHz VHF Converter KG-9128 $22.00 plus postage & packing This simple to build kit makes it feasible to receive, for example, taxis, amateur radio operators, marine radio, television audio carriers, etc. The kit connects in-line with your VHF receiver's antenna avoiding messy installation and receiver modifications.