Dannysound EN129 Thru Zero Oscillator User manual

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Dannysound –EN129 Thru Zero Oscillator
Build Guide v1.05
Contents
Section 1 - Main PCB
Resistors
Diodes
Inductors
IC Sockets
Capacitors
Transistors
Power Socket
Trim Pots
Electrolytic Capacitors
Board Connector
Section 2 –Power Test, Matched Transistors and IC placement
Section 3 –Pots PCB
Resistors
IC Sockets
Capacitors
Transistors
Panel Components
Calibration

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The EN129 is based on the pioneering work by Douglas Kraul and Bernie Hutchins. You can read the
original Electronotes article from 1981 that the design is based upon here
This build guide is for all kits and panel/pcb sets purchased BEFORE September 2020.
The PCB bag label should be white, and on the front PCB it should be written ‘V1.0’ as
circled below
If you’re PCB reads v2.0 then please refer to build guide and BOM titled V2.0
https://www.thonk.co.uk/documents/dannysound/EN129_ThruZero/

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1 –Before starting on the main PCB, first locate the single 220R resistor and solder it into R214 on the front
PCB. This designator is marked 1K but 220R is correct.

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Section 1 - Main PCB
Resistors
1 –15 x 100k resistors

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2 –7 x 10k resistors

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3 –6 x 1k resistors

7
4 –3 x 220k resistors

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5 –3 x 2M2 resistors

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6 –2 x 1k5 resistors

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7 –2 x 1k8 resistors

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8 –2 x 6k8 resistors

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9 –2 x 470k resistors

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10 –1 x 390r resistors

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11 –1 x 2k2 resistors

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12 –1 x 33k resistors

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13 –1 x 150k resistors

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14 –1 x 200k resistors

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15 –1 x 56k resistors

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16 –1 x 1M resistors

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17 –1 x 8M2 resistors