208 Music Easel

[cs_content][cs_section parallax=”false” style=”margin: 0px;padding: 0px 0px 10px;”][cs_row inner_container=”true” marginless_columns=”false” bg_color=”hsla(0, 0%, 100%, 0)” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]Board 1
208-BOM-v2.1-01
[/cs_text][x_image type=”none” src=”” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/01.jpg” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card1_front.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card1_rear.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” bg_color=”hsla(0, 0%, 100%, 0)” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]Board 2
208-BOM-v2.1-02

[/cs_text][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/02.jpg” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card2_front.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card2_rear.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” bg_color=”hsla(0, 0%, 100%, 0)” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]Board 3
208-BOM-v2.1-03
[/cs_text][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/03.jpg” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card3_front.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card3_rear.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” bg_color=”hsla(0, 0%, 100%, 0)” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]Board 4
208-BOM-v2.1-04
[/cs_text][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/04.jpg” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card4_front.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card4_rear.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” bg_color=”hsla(0, 0%, 100%, 0)” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]Board 5
208-BOM-v2.1-05
[/cs_text][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/05.jpg” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card5_front.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card5_rear.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” bg_color=”hsla(0, 0%, 100%, 0)” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]Board 6
208-BOM-v2.1-06

[/cs_text][cs_text]Match Q2 & Q3 for VBE. Watchout the pinout if not using NOS parts.[/cs_text][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/06.jpg” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][cs_text]Decrease R5 from 190K to 82K to tune it to 1.2V/Oct.[/cs_text][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/06_tune_MO.jpg” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card6_front.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/208_card6_rear.png” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px 0px 10px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]Board 7
208-BOM-v2.1-07

The original schematics, as well as the BOM, call for a 27K resistor in this position. My first build had the very-little-Timbre-effect issue, and I tried the suggested 82K resistor replacement on my first build, and I was very happy with the result. On this build, I used 82K when I built initially, and again I am most happy with the result. Should you choose to try 27K here on your build, and find the Timbre response lacking, give the above adjustment a try.[/cs_text][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/07_edit.jpg” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][cs_text]Decrease R14 from 120K to 75K to tune it to 1.2V/Oct.[/cs_text][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/07_tuneCO.jpg” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px 0px 10px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]Board 8

The sine shaper is on board 8 and requires a selected 2N4339, Idss range between .8 and 1.1[/cs_text][x_image type=”none” src=”https://www.samodular.com/wp-content/uploads/2017/02/08a.jpeg” alt=”” link=”false” href=”#” title=”” target=”” info=”none” info_place=”top” info_trigger=”hover” info_content=””][/cs_column][/cs_row][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px 0px 10px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]On both my builds the pulser wouldn’t trigger properly with the 218r, put a 470k in paralell with r56 on the mainboard and now its triggering correctly[/cs_text][/cs_column][/cs_row][/cs_section][/cs_content]