YuSynth synth kit of parts

YuSynth VCO LM394 Module Bare Electronics Parts Kit

 
£33.84 incl VAT
(£28.20 exc. tax)
7220-201
40.00 g.
In stock
Made to order
Normally dispatched within 1-4 days
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Have the right skills, tools and test gear to build your own modular synth, then our kits of parts may be just what you need. As a minimum, you will need to be able to identify electronic components, recognise when they need to be correctly orientated, to be able to use a small soldering iron and finally have access to test equipment. Some modules do not require the use of test equipment but any requirement will be in the 'Setting and Trimming' notes.

The kits include all required electronics components as well as pots & switches. The PCB, connectors and knobs are not included but available from Soundtronics as an option. Our, front panel + matching back panel* really finish off the module in a truly professional way. If you purchase the PCB and components through Soundtronics, then we will also support you with technical assistance just in case you get into any build difficulties.

We only source quality components and we even include the more expensive turned pin IC sockets as we feel the product justifies the extra cost both for reliability and serviceability. Our optional 1/4" jack sockets are by Switchcraft, yes you can save money by buying cheaper sockets hence us offering it as an option because we recognise they are a significant cost. We have standardised on Cliff KM20 knobs for all of our modules but again, as it's an option you can choose different knobs to suit your own preference. Finally, all components are available individually should you not need to purchase the whole kit.

Note

On test, we experienced problems in getting the core ramp generator to oscillate. The YuSynth designer has two voltage regulators feeding the core part of the circuit +Vcc & -Vcc. These are intended to provide a degree of voltage stability to the core circuit and should give around +/-14.2V if using +/-15V regulators on a +/-15V supply. We actually found +13.63 and -14.7V. There are two precision resistors R49 and R50 used to create a 5V reference whioch can only happen if Vcc is 15V, not 13.63V as in our case. We decided to remove the two voltage regulators and bypass them on the basis that the synth power supply we use is very stable and any small fluctuation has an insignificant effect in comparison to the drift due to temperature changes. YuSynth has warned that bypassing the on-board regulators could require a number of resistor values to be changed. We found the circuit performance was not affected and the original resistor values were kept. Your choice as to whether to follow the same route as we did or stick to what is a proven design and looks to work in most cases.

Components Kit Contents (excludes PCB, sockets and knobs)

Reference Part No. Description Qty
R3,R4,R5 2000-161 100k 0.4W 0.1% 15ppm Precision Resistor 3
C8 2069-210 220pF 50V Film Polystyrene Axial Capacitor 1
U1 2230-031 Voltage Regulator 78L12 +12V 100mA 1
U2 2230-041 Voltage Regulator 79L12 -12V 100mA 1
U1 2230-047 Voltage Regulator 78L15 +15V 100mA 1
U2 2230-048 Voltage Regulator 79L15 -15V 100mA 1
R1,R2 7163-007 10R 0.25W 1% Metal Film Resistor 2
R39,R40,R42,R47 7163-051 1k 0.25W 1% Metal Film Resistor 4
R45 7163-055 1k5 0.25W 1% Metal Film Resistor 1
R38 7163-067 4k7 0.25W 1% Metal Film Resistor 1
R25 7163-069 5k6 0.25W 1% Metal Film Resistor 1
R36,R51 (12V version) 7163-072 7k5 0.25W 1% Metal Film Resistor 2
R15,R17,R18,R27,R28,R37 7163-075 10k 0.25W 1% Metal Film Resistor 6
R36,R51 (15V version) 7163-077 12k 0.25W 1% Metal Film Resistor 2
R46 7163-079 15k 0.25W 1% Metal Film Resistor 1
R11,R48 7163-083 22k 0.25W 1% Metal Film Resistor 2
R9,R20 7163-087 33k 0.25W 1% Metal Film Resistor 2
R10 7163-091 47k 0.25W 1% Metal Film Resistor 1
R14,R16,R22,R23,R24,R27, R29,R30,R31,R33,R50 7163-099 100k 0.25W 1% Metal Film Resistor 11
R43,R44 7163-103 150k 0.25W 1% Metal Film Resistor 2
R34 7163-105 180k 0.25W 1% Metal Film Resistor 1
R41 7163-106 200k 0.25W 1% Metal Film Resistor 1
R26 7163-107 220k 0.25W 1% Metal Film Resistor 1
R7 7163-109 270k 0.25W 1% Metal Film Resistor 1
R8,R52 7163-114 470k 0.25W 1% Metal Film Resistor 2
R13,R19,R53 7163-122 1M 0.25W 1% Metal Film Resistor 3
R6 7163-123 3M3 0.25W 1% Metal Film Resistor 1
R32,R49 7163-142 50k 0.125W 0.5% Metal Film Resistor 2
R50 (12V version) 7163-143 70k 0.125W 1% Metal Film Resistor 1
  7212-331 Turned Pin 0.3 inch Dil IC Socket 8 Pin 3
  7212-332 Turned Pin 0.3 inch Dil IC Socket 14 Pin 2
Q1 7212-406 J111 JFET N-Channel Transistor 1
D1,D2,D3,D4 7212-480 1N4148 Signal Diode 4
D5,D6 7212-481 1N4148 3mV Matched Pairs 1
U6,U7 7212-544 Quad Op-Amp BiFET TL074 2
U3 7212-570 Dual FET Input Op-Amp OPA2137PA 1
U5 7212-581 Comparator LM311N Single 1
U4 7212-585 AS394CN ( LM394 ) NPN Matched Transistor Pair 8-Pin Dip Note the pinout for the AS394CN is different, please see image above and the instructions on our AS394 product page here 1
C10 7212-730 10pF 2.5mm COG NPO Monolithic Radial Ceramic Capacitor 1
C9,C11,C12 7212-733 47pF 2.5mm COG NPO Monolithic Radial Ceramic Capacitor 3
C7 7212-734 100pF 2.5mm COG NPO Monolithic Radial Ceramic Capacitor 1
C3,C4,C5,C6,C13 7212-789 100n Polyester Capacitor 5% 5
T3 7212-857 Multiturn Cermet Preset Top Adjust SIL 10k 1
T2 7212-858 Multiturn Cermet Preset Top Adjust SIL 20k 1
T4 7212-859 Multiturn Cermet Preset Top Adjust SIL 50k 1
T1 7212-861 Multiturn Cermet Preset Top Adjust SIL 200k 1
C1,C2 7213-113 Radial Electrolytic Capacitor 22uF 35V 2
R12 7214-000 Linear PTC 1k Thermistor 3000ppm/C LT300014 5% 1
P1...P6 7300-240 Synth Pot 16mm 22k Lin 6

Hi, I’m having an issue with the VCO kit. I’m essentially getting no wave output. Having looked closer, I was supplied with an AS394 chip, the board I believe is designed for the LM394. Should I go ahead and cut pins 1 and 8 off and shunt the chip across? If so could this be the problem with the oscillator I’ve been having? Regarding the tempo thermosistor, should this be now located where pins 4 and 5 were and then coupled to the top of the chip with thermo grease?

Asked by Ryan Bowkett  | 21/05/2018, 11:23 | 3 answer(s)

Thanks for the swift reply! As I’ve had the chip in the wrong pinout, could it have damaged it along with others? As a precaution I have purchased replacements for all of them but would be curious to know. Last question just to clarify that I’m reading it correctly, do I leave out all of the jumper wires pictured on the component layout? Many thanks Ryan

Asked by Ryan Bowkett | 21/05/2018, 21:30 | 1 answer(s)

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