guitar preamplifier with headphone output
Contents
1. practice the guitar without disturbing others H4102IP 1 Features amp Specifications vellemen Features An electric guitar cannot be connected to just any amplifier or audio installation This preamplifier has been designed for this purpose and provides you with a headphone output allowing you to practice without disturbing others Moreover it is fitted with a special device for tone adjustment allowing anyone to create their personal sound M sound adjustment M adjustable input sensitivity M low noise M housing included Specifications e Headphones output max 2 x 50mW 32ohm e Power supply 9V battery not incl e Dimensions 70 x 30 x 105mm 2 8 x 1 2 x 4 1 Men Assembly hints val 1 Assembly Skipping this can lead to troubles Ok so we have your attention These hints will help you to make this project successful Read them carefully 1 1 Make sure you have the right tools AF ine _ TN IE n e A good quality soldering iron 25 40W with a small tip W oo AP SS e Wipe it often on a wet sponge or cloth to keep it clean then apply solder to the tip to give it a wet look This is called thinning and will protect the tip and enables you to make good connections When solder rolls off the tip it needs cleaning Thin raisin core solder Do not use any flux or grease A diagonal cutter to trim excess wires To avoid injury when cutting excess leads ho2. ld the lead so they cannot fly towards the eyes Needle nose pliers for bending leads or to hold components in place Small blade and Phillips screwdrivers A basic range is fine For some projects a basic multi meter is required or might be handy N 1 2 Assembly Hints 5 Make sure the skill level matches your experience to avoid disappointments Follow the instructions carefully Read and understand the entire step before you perform each operation Perform the assembly in the correct order as stated in this manual Position all parts on the PCB Printed Circuit Board as shown on the drawings Values on the circuit diagram are subject to changes Values in this assembly guide are correct Use the check boxes to mark your progress Please read the included information on safety and customer service SUUUUUULUU Lo Typographical inaccuracies excluded Always look for possible last minute manual updates indicated as NOTE on a separate leaflet veleman 1 3 Soldering Hints 1 Mount the component against the PCB surface and carefully solder the leads 2 Make sure the solder joints are cone shaped and shiny A LH 3 Trim excess leads as close as possible to the solder joint Da REMOVE THEM FROM THE TAPE ONE AT A TIME DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ONTO THE TAPE ALWAYS CHECK THEIR VALUE ON THE PARTS LIST velemen 1 Zenerdiode Watch the 3 Capacitors pola
3. rity CATHODE UZDI 4V7 4 IC socket Watch the position of the notch O00000000000 VTI s Construction 5 Resistor trimmers LY RV1 100K Q RV2 1K 6 Switch 7 Electrolytic Capacitors A C10 220uF O C11 220uF A C12 220uF Watch the polarity AH f 7 Construction 8 RCA connectors m Q Jt GUITAR IN Q J2 LINE OUT 9 Headphones connector 3 5mm stereo phone CATHODE lt A LD1 3mmred 11 IC Watch the position of the notch Sige gt 2 amp A IC1 NE5532A Veli 12 Battery snap 7 T The connection leads are first plaited through the openings to reduce pulling The red is connected to the and the black to the RED BLACK Sr N N zu pmm 1 ASTI al UU W KE 2 Men Assembly in the housing 13 Assembly in the housing Attach the sticker showing the connections to the housing fig 4 0 Mount three spacers to the bottom of the housing together with a shakeproof washer and an M3 countersunk bolt see figure 2 0 4mm M3 BOLT NAININNNNNN il 8mm M3 SPACER LOCK WASHER H O U S N G dott 6mm M3 BOLT Fig 2 0 Mount the PCB on the spacers using the three M3 bolts Click the shaft into the tone control potentiometer and mount the knob on the shaft fig 3 0 After connection of the 9V battery check the polarity the cover of the housing can be clicked in place A
4. ssembly in the housing velemen Tone control Power led Power on off Headphones Level adjustment Output Guitar IN Sticker W KE 2 emen Test amp use 14 Test amp use Connect a 9V battery and switch the equipment on The LED should normally light up This LED is also used as a battery low indication Turn potentiometer RV1 to the middle of its adjustment range and connect a pair of headphones to the unit A slight hum should be heard in the headphones when the central terminal of the input connector is touched Turn the tone control RV2 clockwise and slight noise should be heard The guitar can be connected to the input connector by using a suitable cable The sensitivity can be controlled using RV1 The output connector can be connected to the TAPE IN or AUX input of a stereo system Be very careful with the volume knob so that you do not damage your expensive speakers a velleman 15 Schematic diagram SW1 9Vo 6 6 BATTERY GND TT D L HEADPHONE C5 C8 R5 j3 GUITAR IN R10 GND Ji C3 C11 J3 vl e R HEADPHONE GND C R8 2 C9 LEVEL ADJ LINE OUT R11 R6 J2 CONTROL RV2 ae C7 T i 10 16 PCB Men PCB 11 VELLEMAN NV Legen Heirweg 33 B 9890 GAVERE Belgium Europe W velleman_RnD Modifications and typographical errors reserved Velleman nv 5 410329 289188 H4102IP 1 2014 rev 2
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