Page 1: ...cessarily aimed at the complete novice can be built by anyone with some soldering experience All components are standard readily available thru hole components The spacing of the components on the cir...
Page 2: ...optional for holding the PCB Small adjustable wrench or 10mm deep well socket for tightening potentiometer nuts 9 32 open end wrench for tightening toggle switch nuts De soldering braid optional for...
Page 3: ...who d like to get a little more acquainted with electronics Please see the included schematic diagram to follow along4 The schematic is divided up into a few logical sections The oscillators the summ...
Page 4: ...OSC 3 work the same way Summing Mixer U1A is an operational amplifier op amp It adds together the three signals coming through R2 R4 and R18 An op amp connected in this configuration is called a Summ...
Page 5: ...tion a more thorough description of how the filter does this is beyond the scope of this manual Further reading is suggested if you want to gain a better understanding of op amp filters5 Kit Contents...
Page 6: ...cing you The next few paragraphs will go step by step through the process of assembling the circuit board You may wish to check these steps off as you go to keep track of your place ____ Sockets First...
Page 7: ...8 switches The switch is ON when the toggle lever is pointing away from the pair of pins you ve soldered to Now solder the other end of one of those wires to the hole marked P6 on the PCB Solder the o...
Page 8: ...e to the lead of R6 that is nearest the edge of the PCB Turn the power switch ON The multimeter should read 9 volts Now with the negative lead of the multimeter still touching pin 7 of the U2 socket t...
Page 9: ...m ____ 1 0 F Capacitors The 1 0 F capacitors are polarized electrolytic capacitors These are the timing capacitors for the three oscillators Because they are polarized you must pay attention to which...
Page 10: ...are 100k linear potentiometers one is a 100k audio taper pot and one is a 5k audio taper potentiometer The PCB outline for the potentiometers has three numbered pads These correspond to the three legs...
Page 11: ...g leads on the pots Although there are rivet holes on the pot it s best to solder to the long leads which put the solder iron heat a little further away from the inner mechanism of the pot Ok with tha...
Page 12: ...to each of the three leads on the 100k audio A100K potentiometers Solder the other ends of these wires to the pads for R13 Label this potentiometer Filter Frequency Fc ____ Toggle Switches Next solder...
Page 13: ...l still cause a slight amount of dirt when in Non Grit mode but for the most part will be clean To select between Grit and Non Grit you need to decide the value of the resistor R21 If you want Grit mo...
Page 14: ...n the integrated circuit at one end Make sure this notch faces the end of the socket nearest the U1 label It should match the notch in the socket if you installed the socket correctly You may need to...
Page 15: ...otentiometer R1 Now rotate the Filter Width R23 potentiometer The sound color should change Likewise for the Filter Frequency R13 potentiometer Finally rotating the Volume knob should make the sound g...
Page 16: ...Width and Filter Frequency knobs can be used to alter the harmonic content timbre of the drone Turning the Grit switch on and off if you ve implemented this feature selects between mostly clean audio...
Page 17: ...ollowing diagram Now toggling this switch shifts the center frequency of the bandpass filter very low In combination with the Grit this can make some interesting sounds Experiment with different value...
Page 18: ...o the end of R5 that is nearest the edge of the PCB What this circuit bend does is to shift the voltage level of the virtual ground much closer to zero volts This destabilizes the filter causing it to...
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Page 21: ...N ON ON OFF OFF OFF ON OFF OSC 1 Fc Q ON OFF OSC 1 Volume OSC 2 OSC 3 Filter evaton technologies SDIY MDRONE OSC 1 Power ON ON ON OFF OFF OFF ON OFF OSC 1 Fc Q OSC 1 Volume OSC 2 OSC 3 Filter evaton t...
