Low-Noise Stereo Preamp Kit

Code: N47FL


3.2  out of 5 based on 4 reviews
Write a Review

  • Based on the NE5532 chip with independently adjustable output levels (gain typically 100)
  • Operating voltage: 3V to 25V
  • Input impedance: 1kohm

Product details

Low-Noise Stereo Preamp Kit

• Based on the NE5532 chip with independently adjustable output levels (gain typically 100)• Operating voltage: 3V to 25V• Input impedance: 1kohm

Reviews

Write a Review

4 of 4 Reviews

  • Not great....

    Built this as an audio pre-amp to drive some external BBC meters - works fine except that the frequency response of the two channels is widely different - sweeping from 150hz to 1Khz produced output level changes on one channel, but no the other - I guess I need to look at the poor resistors and capacitors to level this out - Changed the 2 1k to 10K, as advised by other post - more stable and much improved, but still pretty poor..and still a channel disparity.

    Was this review useful?  Yes No  1 0

  • Further mods for improvement

    I agree with the previous reviewer; bass roll off at such high frequency is a serious problem for this type of pre-amp. Also with the noise comment but the correct replacement components would be M10k and M100k which are 0.6W rated as opposed to the 2W components in the previous review. Those would be difficult or impossible to fit. Overall an easy kit to assemble and use.

    Was this review useful?  Yes No  1 0

  • Great little kit , bought this to boost the output from a TosLink to Phono adapter, from TV to House Stereo , needed that little bit more as Stereo was nearly on full to get good volume ...now I can turn it down to half way and get great volume. Agree totally with Marc's review and have swapped the resistors for metal film and changed the input values from 1K to 10K ( R1 and R5 ) , this worked brilliant and only needed this on half boost for both channels to get the volume right , eg : same as Tuner /CD Player. Note however , my kit came with 2 Ceramic Capacitors replacing 2 of the Polyesters , and the paper add in did not make it at all clear as it only mentions C2 and C4 nothing about C1 or C5 , to clarify this I used the DOWNLOAD available and looked at the Circuit Diagram , so to help those less knowledgeable here is the answer C4/C5 are Ceramic (Small brown disc stamped 104) , C1/C2 are Polyester ( Yellow and Rectangular ) , also NOTE the IC chip in the picture shown is fitted the wrong way around , the DOT should be at the other end with the NOTCH on the 8 pin DIL Socket. I also used a 12v 1A ( 500mA would be OK ) wall wart to supply the power to this . One last thing , if you buy the 6 extra resistors at the same time you get free delivery , as it goes just over £10 ,and you save the £2.99 delivery, so you can upgrade this kit for free almost :)

    Was this review useful?  Yes No  5 0

  • I'd love to report this is a great kit - and the NE5535 is a fairly neat chip so it's a good choice and the use of single-rail biasing is convenient. Things go downhill from there though. I've come to trust designers and when I first built one of these I was disappointed by the performance; particularly at the low end. Turns out this amp - simply down to poor component choice - rolls off at around 160Hz - making it pretty useless for music. Simply increase the 1K resistors to 10K (dropping the gain to x10) and a more respectable 16Hz rolloff is achieved; together with a more respectable 10K input impedance. Worse perhaps, is the choice of carbon film resistors - while these are easier to read than the metal film ones sold by Maplin (the blue body ones) they are noisy! Swap them for the stock Maplin metal film and presto, you have yourself the beginnings of a decent audio amp - for little extra cost. Six off D100K and two of D10K will do nicely! If you need more gain, just chain two together or increase the value of the feedback resistor - but beware that the NE5535 is prone to oscillations; and this board is no exception.

    Was this review useful?  Yes No  15 0

Questions

Ask a Question

5 of 5 Questions

  • James said:

    Hi, could I attach two ECM mics (Order Code: QY62S) to the + and - inputs on this preamp, and a 9v battery or similar?

    Yes the product does support that.

    Was this answer useful?  Yes No  1 0

  • jell shore said:

    can this pre am be used to between my hifi and subwoofer to make the passive subwoofer louder so i can hear the bass ?

    No sorry this product does not support that.

    Was this answer useful?  Yes No  0 0

  • Paul Maloney said:

    MAP 437 - N47FL Would this pre-amp circuit work to boost the output of an MP3 player (low output impedance)to a level suitable to drive the AUX input of a typical stereo receiver?

    Yes the product does support that.

    Was this answer useful?  Yes No  8 0

  • nigel said:

    Could this preamp (N47FL) be used to amplify the signal from a lapel mic being used in an acoustic guitar?

    Yes the product does support that.

    Was this answer useful?  Yes No  1 0

  • Lost Ninja said:

    Would this be suitable for amplifying an MP3 player prior to playing through Speakers?

    No sorry this product does not support that.

    Was this answer useful?  Yes No  0 1

Bulk Prices

Item code Item name Quantity Price
N47FL Low-Noise Stereo Preamp Kit (100+) £6.37
N47FL Low-Noise Stereo Preamp Kit (25+) £6.79
N47FL Low-Noise Stereo Preamp Kit (10+) £7.22
N47FL Low-Noise Stereo Preamp Kit (5+) £7.64
N47FL Low-Noise Stereo Preamp Kit (1+) £8.49

Why not tell us and our B2B sales team about your specific business needs and expectations?

Offering a 1-2-1 personal account management service each representative is ableto help you ensure the service from Maplin meets your approval on all levels everytime.

As well as being able to help you benefit from volume quotations and bespoke productsourcing our team also offers a wide range of business services including:

  • 30 Day EOM credit terms available on application
  • FREE delivery on all orders above £10
  • A range of guaranteed delivery services to ensure your goods are with you to meetthose tight deadlines
  • Proforma Invoices
  • Scheduled and forward ordering system
  • Product branding and bespoke product sourcing available on application
  • Online and in-store account use
  • 5% discount for all schools and colleges
  • 7% discount for all universities
  • Sample product service - available on application
  • Supplier cross-referencing and BOM quotations

As you can see, our range of services is comprehensive and built to service everytype of business need. We are committed to providing your business with 1st classsales and customer service.

Our aim is to establish mutually beneficial long-term relationships where our customersreceive a high class of reliable service.

Please contact us on 0844 557 6000 to discuss your business needs with your individualaccount manager.

£8.49

  • Home Delivery
  • Click & Collect

Live chat