duhvoodooman wrote:
Try this link for the current schematic; the one in the instructions contains a typo:
http://www.byocelectronics.com/largebea ... ematic.pdfThe cap and resistor values you have listed are for the older rotary switch version of the LB.
The purpose of the on-off-on toggle switch is two change the effective capacitance value of C12. With the toggle in the off middle position, C12 is 3.9nf which gives the classic Big Muff "scooped" midrange at the mid-point on the tone control. Since caps in parallel give the additive capacitance of the two, switching on the 8.2nf cap (Flat setting) raises the effective C12 capacitance to 12.1nf, giving a flat frequency response at the midpoint. Switching on the 47nf cap (Hump setting) will give an effective capacitance of 51nf, resulting in a midrange hump in the control.
Because of the flexibility of these three settings and the frequency range afforded by the tone control across its sweep, I'm quite confident that you can achieve that that '73 tone you're seeking with a bit of tweaking. You can always change R19 to a 33K to match the KR data, if you wish. I'm sure BYOC would include one with your kit if you request it. The cap values you mentioned are close enough to the BYOC caps that the differences are inconsequential.
The other toggle switch takes the tone stack out of the signal path completely, giving a louder, flat frequency output, since there isn't signal loss or frequency response alteration through the tone stack.
Hope this helps....
Thanks again! Got the latest schematic downloaded. I'll probably leave those 2 values the same since they are so close. A lot of them are a little further off. If you are interested, here's the complete list of components changing (according to the old schematic) - I will check the new schematic before i purchase the ram's kit and the components to build the customizations.
Do you by chance have a copy of the locations of components on the circuit board (like where R1, R2, etc. is located)? I think that may be helpful to me.
These are listed as "component value I need" > "Schematic Location” “original value listed at location on schematic"...
Resistors...
100k > R3 43k
100R > R1 120R
100R > R8 150R
10k > R19 15k
10k > R23 15k
33k > R13 22k
33k > R5 39k
33k > R14 39k
470k > R22 430k
560R > R12 1k
Capacitors...
470pF > C2 560pF
470pF > C5 560pF
470pF > C12 560pF
0.1uF > C6 1uF
0.1uF > c13 1uF
0.1uF > C15 1uF
0.1uF > C1 10uF