AUDIO AMPLIFIERS MIXERS AND VU METERS

Future Kit offers a range mono and stereo audio amplifier kits from a lowly 0.2 Watts per channel up to a mighty 100Watts RMS per channel. Mixers, preamplifiers, speaker protection and VU meters are also featured here.

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Here's Value
FK675 2W+2W Stereo Amplifier supplied with two 90mm x 50mm 8 Ohm 3W Speakers. Build a docking station for your MP3 or make up an external amplifier for your laptop.  Maximum Power Output 2W per channel. Frequency Response 20Hz to  20kHz(-3dB). Volume control by trimmer that can be replaced by an external pot. SNR: 80dB (A weighted) PCB Size 56mmx48mm.  

For teachers, please ask us about our new "Boom Box Project" kit and Teacher Resources.

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FK101 6 LED Mono VU Meter Keep an eye on your speaker drive with this simple VU meter.  Powered by your amplifier circuit, this unit requires no additional supply.
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FK102 10 LED Stereo VU Meter Monitor your speaker drive with this simple two channel VU meter.  Powered by your amplifier circuits, this unit requires no additional supply.
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FK103 Wireless  VU Meter This VU meter is designed to be portable for measurement of sound levels anywhere in the listening field.  The FK103 receives audio signals via an inbuilt microphone and displays their sound level on highly efficient LEDs.  The FK103 can also be used as a party talking piece when it is built into Robot or "Ghostbuster®" costumes as it follows the voice of the wearer or another guest.  Substitute blue LEDs for dramatic effect.
Works from 9V-12V and draws just a few milliamps.
Unit Dimensions: 3.45" x 2.18" x 0.6"(incl. components)  (88mm x 55.5mm x 15mm)
Recommended Housing: FB17
 

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PLEASE NOTE: KIT HAS GREEN AND RED LED'S IN REVERSE ORDER TO PICTURE SHOWN.

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FK602 General Purpose 2Watt Mono Amplifier.  This compact, economical amplifier can be built in less than one hour. Lots of uses. Intercoms, MP3 boosters. Add power to your micro FM radio. 3-12V operation.  Price  inc. GST.  Add  Pack and Post

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FK603 2W Stereo Amp This unit has similar specifications to our FK675 - just add your own speakers.  A great replacement module for the old valve units.  Rebuild the retro look players and radios of the 50s and 60s.
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FK605 8W + 8W Stereo Amp 8 watts doesn't sound much these days, but for most personal listening applications this puts out more than enough. Price inc. GST. Add P & P

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FK607 15Watt BLT Mono Audio Amplifier.  This economical, compact, single IC amplifier can be constructed in 20 minutes or less so that it makes an ideal classroom project. Applications include audio output amplifiers for MP3, FM receivers, instumentation and easy listening amplifier for miniature radios and audio equipment.
Power Supply voltage: 12 VDC / more than 1A, Music power output : 15W into  4Ω, Signal/noise ratio : 80 dBA, Input sensitivity : 150mV / 200kΩ< Frequency response : 20Hz to 20kHz (-3dB)Gain : 30dB. max., Total harmonic distortion (THD) : 0.1% @ 1W, 4Ω< Overload and short-circuit protected, Dimensions : 60mm x 60mm x 38mm(inc heatsink).
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FK608 BTL 15 W Stereo Amp Specification:Supply voltage : 12 VDC / more than 2A, Music power output : 2 x 15W / 4Ω, Signal/noise ratio : 80 dBA, Input sensitivity : 150mV / 200kΩ< Frequency response : 20Hz to 20kHz (-3dB)Gain : 30dB. max., Total harmonic distortion (THD) : 0.1% @ 1W, 4Ω< Overload and short-circuit protected, Dimension : 4.76 x 1.89 inches.Price inc. GST. Add P & P

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FK617 15W Mono Amp for Instruction Purposes
This is an ideal classroom project and will result in a useful amplifier for building into podiums,  P.A. units or for guitar practice.
Supply voltage : 12VDC @ more than 1A, P
ower output : 15Wrms @ 4
Ω (BTL), Total harmonic distortion (THD) : 0.1% @ 1W, 4Ω< Dimension : 4.10 x 2.31 inches.Price inc. GST. Add P & P

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FK626 Stereo Input Pre - Amp/Tone Control features twin amplifiers, treble and base controls.  It will expand the functionality of general purpose stereo amplifiers. Students will gain practical experience with RC filtering in audio systems.   Supply voltage: 6-15 VDC / 25 mA.max Maximum output : 3Vrms @ 12VDC supply
Maximum input : 3Vrms @ 12VDC supply, Gain (loss) : -2 dB.
Input impedance : 47kΩ,  Frequency response : 20 Hz to 50kHz @ -3dB,
THD @ 1kHz : 0.1% @ 1V output.     S/N ratio : 85 dB re.  1Vrms,
Bass boost/cut : 12 dB @ 50 Hz,Treble boost/cut : 12 dB @ 15 kHz,
Dimension : 4.74 x 1.39 inches. 4.74 x 1.39 inches.   Price inc. GST. Add P & P

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FK627 Tone Control Unit featuring bass, treble and volume controls, is designed to be compatible with OCL Amplifiers running from dual voltage rails. The voltages required for this kit are 15-0+15. PCB dimensions 86mm x 32mm.  Unit Price inc GST. Add Pack and Postage

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FK643 Stereo Bass Booster Insert this unit between the source and the tone control. Supply voltage : 12 VDC @ 20mA. max., Input impedance : 47Kohm, Frequency range : 150Hz to 250Hz Dimensions : 2.77 x 2.85 inches.Price inc. GST. Add P & P

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FK647 Microphone Amplifier This low cost unit allows low impedance microphones to be used with hi-impedance amplifier inputs. Power 9-12V Price inc. GST. Add P & P

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FK648 Condenser Mike fitted with Pre-Amp Put this into one of our low cost boxes and you've built a quality microphone that you can plug into your stereo amplifier. Price inc. GST. Add P & P

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FK650 Stereo Speaker protectors This 12v powered  unit prevents the power on inrush from damaging your speakers by delaying their connection until the amplifier circuit has stabilized. Price inc. GST. Add P & P

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FK651 Stereo Simulator
An interesting unit to convert your transistor radio into a "stereo" source.  By selecting frequencies and sending them to separate channels the FK651 tricks the ears into experiencing a stereo effect.
Power 12V Price inc. GST. Add P & P

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FK652 3 Channel Microphone Pre-amp Mixer Building a PA unit or entertainment amplifier?  This handy mixer helps control the balance of three inputs plus a master control  
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FK654 Loudness Control  This unit works by boosting the upper and lower frequencies using three filters to give the listener a richer sound. Fit is between the sound source and the tone control. 12v Power Price inc. GST. Add P & P

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FK657 OTL 30W Stereo Amplifier. Power supply 50V
Frequency response  20Hz to 30Khz Output power 30W rms per channel into 4 or 8 Ohms
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100Watts RMS Per Channel of Pure Grunt !!!
FK 667
100 Watt per Channel Stereo Amplifier OCL
This compact unit is for the serious hobbyist.  Use it as a booster for your MP3 Player or attach it to your portable CD unit to hear the stuff you are missing. Features: Frequency Response 10Hz to 100KHz (+/- 1dB) OCL for protection, Sensitivity: 1Vrms into 20KOhms. Amplifier Class AB, Total Harmonic Distortion: 0.02%  Power Requirement Dual 50VDC.  PCB Size (x2) 148mmx61mm 

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Also available in Mono as FK 666 100 Watt P.A. Amplifier 

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FK670 100 to 300Ohm Impedance Matching Preamplifier This 12V unit is used to match the imepdance between low impedance sources such as tape heads to a 300ohm input amplifier.


Obsoleted item.

Available while stock lasts.  Contact us for a special quote if you want more than 1 item.

Price inc. GST $6.22 Plus P & P

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FK671 48W Sub Woofer Amplifier (Single Channel) Add bass OOOMPH to your system with this bass booster. Bandwidth frequency : 25 to 200 Hz, Input sensitivity : 1Vrms., Input impedance : 100K Output power : 48Wrms class AB @ 4 or 8Ω, Power supply +35V-0-35V Dimension : 4.53 x 2.48 inches. Price inc. GST.  Add P & P

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FK672 2 Watt Amplifier With Speaker Make a megaphone, practice your musical instrument in your bedroom, or add an electronic feature to just about any musical instrument. Power 4.5v-12v  Price inc. GST. Add P &P

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FK673 1W Per Channel Stereo Amplifier. It's unlikely you'll ever build a simpler stereo amplifier.  Powered from 3V to 12v, the FK673 can deliver up to 1 Watt per channel into 8 Ohm speakers. S/N ratio 70dB (A weighted) Sensitivity  (1kHz/500mW) : 120mVeff) Dimensions 2.16 x 1.36 inches.Price inc. GST. Add P & P

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FK676 STEREO HEADPHONE AMPLIFIER  KIT Here is a lightweight compact amplifier that can couple the low level output of MP3 players tuners and instruments to earphones for privacy and detailed audio interpretation.   Applications include metal finders, radio beacon locators, language laboratories, cable checkers and private listening.
Power supply: 3V-12v (2 AA cells) @ 60mA max
Output capability: 1Watt +1Watt 8Ohm Speaker
Level adjustment: On board trimmer potentiometer
S/N Ratio: 70dB (A weighted)
Sensitivity: (1KHz 500mW): 120mV
Dimensions: 2.24" x 1.34"

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MXA O43 5 Channel Mini Surround Sound Module Add dimension to your HDTV viewing. This little unit decodes the input signal into its 4 directional channel outputs plus a sub woofer 5th channel for ambience. 12V @ 11mA power required. Price inc. GST. Add P & P

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MXA044 3 Channel Karaoke Microphone Mixer Controls the input level of 3 microphones, echo effect and music inputs  for a full karaoke effect. Power 12V @ 45mA.  Price inc. GST. Add P&P

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