ACTIVE XOVER
AT LAST YOU CAN BI-AMP THAT SPEAKER WITH OUR NEW, NO COMPROMISE ACTIVE CROSSOVER UNIT. EMPLOYING THE LATEST STATE OF THE ART HYBRID TECHNOLOGY. THIS PROJECT OFFERS TRULY HIGH END PERFORMANCE AND CONSISTS OF A TWO WAY 4TH ORDER LINKWITZ-RILEY FILTER. USING NO LESS THAN 4, YES 4! ECC82's AND LOW NIOSE TRANSISTORS IN A DIRECT COUPLED UNITY GAIN BLOCK THD IS KEPT TO A MINISCULE 0.005%, MAINLY 2ND HARMONIC AT NORMAL LINE LEVELS. THE DESIGN IS VERYSIMPLE TO BUILD WITH ALL THE MAJOR COMPONENTS BEING MOUNTED ON A SINGLE PCB. WITH THE COMPNENTS SUPPLIED YOU CAN SET YOUR CROSSOVER  BETWEEN 1 - 5kHz .
A FULL DESIGNER APPROVED KIT IS AVAILABLE FOR THIS PROJECT (INCLUDING PSU, CASE VLAVES INPUT / OUTPUT SOCKETS) FOR 350 + 10 POST

4W SE CLASS A POWER AMP
THIS  MONTH. IF YOU THINK 2500 FOR A 4W POWER AMP IS TAKING THE PISS, JOIN THE CLUB! THIS MONTH I   EXCLUSIVELY   REVEAL MY  OWN SINGLE  ENDED CLASS A 4W POWER AMP. VERY SIMPLE TO BUILD ONLY   LACKING A FEW    ACRES    OF BRUSHED    ALUMINIUM BUT GENERATING CONSIDERABLY LESS DISTORTION  THAN THE  2500 MODEL.
AS USUAL  A FULL     KIT IS AVAILABLE (200 + 10P&P)

OR IF YOU LIKE, JUST THE OUTPUT INDUCTORS FOR (99 +_10P&P)
EITHER AT A MOUTHWATERINGLY LOW PRICE.

PASSIVE PREAMP
ALSO AVAILABLE THIS MONTH, JEFFS PASSIVE PREAMP ARTICLE,       iF YOU'RE LOOKING FOR A SIMPLE TO BUILD    YET EFFECTIVE    PASSIVE   PREAMP  YOU'LL BE HARD PUT TO FIND A BETTER DESIGN ANYWHERE. FEATURING  0.1%   TOLERANCE,  15ppm/K  TEMPERATURE COEFFICIENT ULTRA PRECISION RESISTORS THIS PREAMP MAINTAINS  CHANNEL   BALANCE TO WITHIN 0.01db, SOME 50 TIMES CLOSER THAN A NORMAL POT AND FAR BETTER THAN THE MOST VAUNTED 'HI FI' ONES.FULL KIT 99 +8 POST

FOR MORE DETAILS SEE  PREAMP PAGE



FEEDBACKLESS HYBRID POWER AMP
THIS PROJECT IS A HYBRID AMP WITH A DIFFERENCE,    HIGH OUTPUT POWER, 40W INTO 8OHM, FREQUENCY RESPONSE FROM 5Hz TO 50kHz, S/N RATIO <-90db. THD < 1% ,TYPICALLY < 0.5%MOSTLY 2nd HARMONIC AND USING  NO FEEDBACK.     THE NEAREST COMMERCIAL DESIGN WE CAN FIND COSTS OVER 1600. VERY EASY TO BUILD FROM KIT AT A REFRESHINGLY SMALL PRICE.
COMPLETE,  DESIGNER  APPROVED   KIT IS  AVAILABLE   FOR 199+12POST