CLOCK DIVIDER & MULTIPLIER Original schematic and other information: sound-force.nl CHANGING RATIO Simply change the numbers if you wa...

CLOCK DIVIDER & MULTIPLIER

Original schematic and other information: sound-force.nl



CHANGING RATIO


Simply change the numbers if you want to change the ratios.



STRIPBOARD LAYOUT

-100nF, decoupling capacitor is soldered next to PCF8574, not underneath the board.

-Those ugly looking octopuses are actually RGB leds (PL9823).

-When you upload the sketch, you should install the libraries first. Without them, it won't work.


FACEPLATE LAYOUT

8hp (40mm x 129mm)

It's actual size so you can use it as a drilling template.


3.5mm jack : 6mm

SPDT toggle switch : 6mm

PL9823 led : 5mm

mounting screw : 3mm

stand-off : 3mm





This is a 4-channel PWM sender with a passive volume controller using FSR. I made it especially for my modified cassette tape player that...



This is a 4-channel PWM sender with a passive volume controller using FSR. I made it especially for my modified cassette tape player that I posted before. Each channel has a potentiometer and a switch, so I can set different pulse width on each channel, send them to the cassette player and the cassette's motor will rotate at different speed depending the PWM this box sends.


And also I added a very simple passive volume controller using FSR. The output from the cassette player feeds into this box, and through the volume controller, now I can control the volume with FSR. It's not working linearly, so don't expect its working like a touch-sensitive pad out there. Its control range is very shallow so will be abit hard to control the volume like what you expect.



SIGNAL FLOW DIAGRAM




SCHEMATIC




STRIPBOARD LAYOUT



FRONTPANEL LAYOUT

I used Hammond 125B clone as an enclosure.

This layout is actual size, so you can use it as a drilling template. As you can see, I used mechanical keyboard switches, so it's abit hard to cut the square holes. 





ORIGINAL SCHEMATIC & OTHER INFORMATION: YUSYNTH STRIPBOARD LAYOUT 1 2 FACEPLATE LAYOUT This layout is actual size, so you can use it...


ORIGINAL SCHEMATIC & OTHER INFORMATION: YUSYNTH




STRIPBOARD LAYOUT


1

2


FACEPLATE LAYOUT

This layout is actual size, so you can use it as a drilling template.


3mm : LEDs & mounting screw holes

6mm : 3.5mm jacks & DPDT toggle switch

7mm : Potentiometers





SWITCHED MULTIPLE WIRING DIAGRAM FACEPLATE LAYOUT

SWITCHED MULTIPLE



WIRING DIAGRAM






FACEPLATE LAYOUT









MFOS State Variable VCF Original Schematic and other information: musicfromouterspace STRIPBOARD LAYOUT All decoupling capacitors, 100nF ...

MFOS State Variable VCF

Original Schematic and other information: musicfromouterspace




STRIPBOARD LAYOUT

All decoupling capacitors, 100nF are soldered underneath the boards. Solder the caps across V+ and V- of each ICs.




FACEPLATE LAYOUY

It's actual size so you can use is as a drilling template.


3mm holes : mount screw holes

6mm holes : 3.5mm jacks

7mm holes : potentiometers 






ORIGINAL SCHEMATIC & OTHER INFORMATION: birthofasynth STRIPBOARD LAYOUT Original circuit uses LF442 and LM394 for the exponential conv...

ORIGINAL SCHEMATIC & OTHER INFORMATION: birthofasynth




STRIPBOARD LAYOUT

Original circuit uses LF442 and LM394 for the exponential converter. As you know, LM394 is obsolete and LF442 is hard to find these days, so I substituted LM394 with a matched pair of 2n3904s and LF442 with TL072. I have no significant issues so far.



'SKEW MODIFICATION'

The 'Skew' does nothing until it passes 12o'clock. If the 1st pin of 'Skew' potentiometer is connected to '-3v' instead of '-12v', it starts morphing the wave once you turns the knob. So I added a simple voltage divider as you can see above.




FACEPLATE LAYOUT

The dimension is 30mm(6hp) x 129mm


7mm hole : potentiometer (6ea)

6mm hole : 3.5mm jacks (7ea)

6mm hole : DPDT On-On toggle switch (1ea)

3mm : mounting screws




MEASUREMENT

Sine wave output: 9.99Vpp



Triangle wave output: 9.55Vpp



Pulse wave output: 9.95Vpp



Frequency range: 0.35Hz ~ 20.9KHz




Skewed triangle wave




Skewed sine wave







Original schematic, BOM and information: LINK STRIPBOARD LAYOUT Three of Twin-T. Each one has different value of capacitors, normally hig...

Original schematic, BOM and information: LINK



STRIPBOARD LAYOUT



Three of Twin-T. Each one has different value of capacitors, normally higher value you put, lower frequency you get. I ended up selecting 470nF, 100nF and 22nF, however it's worth trying different value to meet your taste. And led also changes the tone depending on its color. 

All decoupling capacitors, 100nF are soldered underneath the boards.



FACEPLATE LAYOUT

6hp faceplate layout. The dimension is 30mm x 129mm.

It's actual size so you can use it as a drilling template.


Potentiometer: 7mm

3.5mm jack: 6mm

Mounting screw: 3mm





MFOS VC LFO with Sync Input Modification Schematics& BOM MFOS VC LFO : LINK Sync Input Modification : LINK STRIPBOARD LAYOUT -All dec...




MFOS VC LFO with Sync Input Modification


Schematics& BOM

MFOS VC LFO : LINK

Sync Input Modification : LINK



STRIPBOARD LAYOUT




-All decoupling capacitors, 100nF, are soldered underneath the boards.

-I decided to add 'Sync Mod' after LFO circuits were done, so I attached Sync Mod circuit underneath the lowest the board.



FACEPLATE LAYOUT

-The layout is actual size, so it can be a drilling template.


<Hole Diameter>

Potentiometer: 7mm

3.5mm jack: 6mm

LED: 3mm

Screw hole: 3mm



MEASUREMENT

..





MFOS LOG& LIN VCA Original schematic: MFOS STRIPBOARD LAYOUT -All de-coupling capacitors, 100nF, are soldered underneath the boards. -T...

MFOS LOG& LIN VCA
Original schematic: MFOS



STRIPBOARD LAYOUT

-All de-coupling capacitors, 100nF, are soldered underneath the boards.
-To reduce the depth of a module, I attached the board LM13700 is placed behind other two boards by using jumper pins like the pic above, which is a little bit tricky but not that hard to do.



FACEPLATE LAYOUT

The layout is actual size so you can use it as a drilling template.

-Potentiometer : 7mm
-3.5mm jack : 6mm
-Toggle switch : 6mm
-Screw hole : 3mm