SK109-Scale-bias
You are viewing an old revision of this post, from January 1, 2013 @ 15:09:25. See below for differences between this version and the current revision.
This module scales the input signal (gain from 0 ~ 1.2) and applies a bias to it (shift it up or down). It works from DC to video frequencies on both the signal and the CV inputs.
It allow s for nice stuff like signal multiplication, luma keys etc.. but is also very handy to get CV-signals into a more useful range.
Note: A negative biased video signal will pull down other channels on the mixer! We should probably add the possibility to clip the output signal between 0 and 1.4V volts, like it’s done on the original sk09-scalebias module.
Module Info
Inputs: | – Siff (0-1V) – Scale (0-1V / -1 – 1V) – Bias (0-1V / -1 – 1V) |
---|---|
Outputs: | Siff out |
Power Draw on +5V: | 22 mA |
Power Draw on -5V: | 22 mA |
Frequency Response: |
Schematic & PCB
Parts List
Qty | Value | Device | Package | Parts | Description |
4 | 3,17/1,1 | 3,17/1,1 | BIAS-IN, GAIN-IN, OUT-, SIFF-IN | THROUGH-HOLE PAD | |
2 | CPOL-EUCT6032 | CT6032 | C10, C12 | POLARIZED CAPACITOR | |
5 | 100 | R-EU_R1206 | R1206 | R102, R202, R302, R304, R305 | RESISTOR |
8 | 100k | R-EU_R1206 | R1206 | R103, R104, R105, R106, R203, R204, R205, R206 | RESISTOR |
8 | 100n | C-EUC1206 | C1206 | C100, C101, C103, C200, C201, C203, C300, C301 | CAPACITOR |
2 | 10k | POT | ALPS_RK09L1120 | BIAS-POT10K, GAIN-POT10K | |
1 | 180 | R-EU_R1206 | R1206 | R308 | RESISTOR |
8 | 1M | R-EU_R1206 | R1206 | R113, R114, R115, R116, R213, R214, R215, R216 | RESISTOR |
3 | 1k | R-EU_R1206 | R1206 | R207, R217, R303 | RESISTOR |
1 | 1k6 | R-EU_R1206 | R1206 | R218 | RESISTOR |
4 | 20k | R-EU_R1206 | R1206 | R108, R109, R208, R209 | RESISTOR |
1 | 22 | R-EU_R1206 | R1206 | R307 | RESISTOR |
1 | 22-23-2031 | 22-23-2031 | 22-23-2031 | X1 | MOLEX .100″ (2.54mm) Center Header – 3 Pin |
2 | 2k2 | R-EU_R1206 | R1206 | R107, R117 | RESISTOR |
2 | 2u2tantal | CPOL-EUCT6032 | CT6032 | C302, C303 | POLARIZED CAPACITOR |
1 | 300 | R-EU_R1206 | R1206 | R306 | RESISTOR |
1 | 47k | R-EU_R1206 | R1206 | R301 | RESISTOR |
2 | 4k7 | R-EU_R1206 | R1206 | R101, R201 | RESISTOR |
2 | 50p | C-EUC1206 | C1206 | C102, C202 | CAPACITOR |
1 | 75 | R-EU_R1206 | R1206 | R309 | RESISTOR |
3 | BAT54S-L44 | DIODE_2CACA-SOT23 | SOT23 | D2, D6, D101 | 2 Diodes |
2 | LMH6643MA | MAX4392ESA | SO08 | IC1, IC2 | |
1 | LT1228 | LT1228 | SO08 | IC3 |
Photos
Observations
the “scale” side of things could have some more punch.
Revisions:
- December 29, 2013 @ 16:59:04 [Current Revision] by Michael
- December 29, 2013 @ 16:59:04 by Michael
- November 21, 2013 @ 21:29:06 by Michael
- November 20, 2013 @ 17:29:33 by Michael
- January 1, 2013 @ 15:09:25 by Michael
- January 1, 2013 @ 15:09:16 by Michael
- December 12, 2012 @ 13:20:44 by Michael
- December 12, 2012 @ 13:19:34 by Michael
- December 12, 2012 @ 13:13:11 by Michael
- December 12, 2012 @ 13:11:50 by Michael
- December 12, 2012 @ 13:10:37 by Michael
Changes:
January 1, 2013 @ 15:09:25 | Current Revision | ||
---|---|---|---|
Content | |||
This module scales the input signal (gain from 0 ~ 1.2) and applies a bias to it (shift it up or down). It works from DC to video frequencies on both the signal and the CV inputs. | This module scales the input signal (gain from 0 ~ 1.2) and applies a bias to it (shift it up or down). It works from DC to video frequencies on both the signal and the CV inputs. | ||
It allow s for nice stuff like signal multiplication, luma keys etc.. but is also very handy to get CV-signals into a more useful range. | It allow s for nice stuff like signal multiplication, luma keys etc.. but is also very handy to get CV-signals into a more useful range. | ||
<strong>Note</strong>: For better gain lift R215 from ground and connect to negative base of gain pot. | |||
<strong>Note</strong>: Pushing R307 to 220 Ohms and R308 to 1k8 seems to remove some tendency to oscillate | |||
<strong>Note</strong>: A negative biased video signal will pull down other channels on the mixer! We should probably add the possibility to clip the output signal between 0 and 1.4V volts, like it's done on the original <a title="SK09-Scale-Bias" href="http:// synkie.net/modules/sk09-scale- bias/">sk09-scalebias</a> module. | <strong>Note</strong>: A negative biased video signal will pull down other channels on the mixer! We should probably add the possibility to clip the output signal between 0 and 1.4V volts, like it's done on the original <a title="SK09-Scale-Bias" href="http:// synkie.net/modules/sk09-scale- bias/">sk09-scalebias</a> module. | ||
<h3>Parts placement</h3> | |||
<a href="http:// synkie.net/wordpress/wp-content/ uploads/2012/ 12/sk109-place.png"><img class="alignnone size-large wp-image-351" alt="sk109-place" src="http://synkie.net/ wordpress/wp- content/uploads/ 2012/12/sk109- place-1024x814.png" width="1024" height="814" /></a> |
Note: Spaces may be added to comparison text to allow better line wrapping.