Steffen

ssl external sidechain
« Reply #20 on: February 10, 2005, 03:58:30 PM »
Quote from: "Greg"
Thanks Steffen. Let me make sure I have this implementation correct. I take the TO SIDECHAIN points to the FROM INPUT BUFFERS of your filter, then the TO CONTROL AMP goes to a 47K resistor to pin 1. What about the 100p and 15K from pin 1 to ground. Does that stay, or go?



exactly!  :grin:

everything else (100p, 15k.....) is the same....

steff


digichild

sidechain in ssl
« Reply #21 on: February 25, 2005, 01:18:53 PM »
Quote from: "gyraf"
An approach for a (mono) sidechain insert could be:

Take the two "to sidechain" signals, and add them together with two 4K7 resistors.

This becomes your insert send.

Connect the two 47K's at the input of the sidechain together.

This becomes your insert return.

Use a tip/ring stereo jack socket. Send to ring and return to tip. Normalize ring to tip. This way you can also use the insert as an input (for ducking etc.), and if no jack is inserted it will just act as a normal clone.

Result: Insert point output impedance ~2K5, input impedance ~25K.

This should be good enough for most purposes.

Unless I missed something - I havent really slept enough the latest couple of days..

Jakob E.


i only want to use the sidechain for triggering the ssl-i don`t need a return-apart from this i don`t understand at all where i have to connect from the jack to the switch and then to the board :roll:
Berlin, Germany

daArry

ssl external sidechain
« Reply #22 on: March 15, 2005, 02:42:11 PM »
Hey,

I just vero'ed this sidechain circuit, but added a DRV/INA134 combo for balanced send/receive. I left out the 100R sc send resistor and just went straight to the DRV - this coo? likewise with the INA, I just went straight to switch posistion6 and skipped the 47u cap and 47K res to ground...

For powering these 3 IC's I just fed of the main +/-15V supplies - will the extra pull be okay for the vregs? Seems okay...so far :thumb:

Cheers

digichild

ssl external sidechain
« Reply #23 on: May 15, 2005, 07:44:43 AM »
Quote from: "gyraf"
An approach for a (mono) sidechain insert could be:

Take the two "to sidechain" signals, and add them together with two 4K7 resistors.

This becomes your insert send.

Connect the two 47K's at the input of the sidechain together.

This becomes your insert return.

Use a tip/ring stereo jack socket. Send to ring and return to tip. Normalize ring to tip. This way you can also use the insert as an input (for ducking etc.), and if no jack is inserted it will just act as a normal clone.

Result: Insert point output impedance ~2K5, input impedance ~25K.

This should be good enough for most purposes.

Unless I missed something - I havent really slept enough the latest couple of days..

Jakob E.


excuse my ignorance,but what are the two "to sidechain" signals?
are they located leftside from the distortiontrimmer when i look on the board?

if it is like this,do i have to cut before left or right side of the resistors?
Berlin, Germany

radiance

ssl external sidechain
« Reply #24 on: May 15, 2005, 01:00:05 PM »
Before attempting the side-chain mod you should have a thorough look at the schematic and also a thorough look at the pcb.
On the schematic  you can see clearly where the "to sidechain" signals are which is after the 22u/35v cap and before the 15k resistor. They lead to the two 47k resistors (which are before the side-chain VCA).
Those two 47k resistors are easy to spot on the pcb. They are on the left top corner off the left VCA. Then folow the pcb trace back till you reach the 22u/35v cap and voila, that's the to side-chain connection..
"Knowing that you are dreaming, however, does not automatically guarantee full rationality.
Then again, being awake doesn't ensure good thinking, either." -  Lynne Levitan

digichild

Heat on powerregulator 7812
« Reply #25 on: May 18, 2005, 12:33:39 PM »
Quote from: "radiance"
Before attempting the side-chain mod you should have a thorough look at the schematic and also a thorough look at the pcb.
On the schematic  you can see clearly where the "to sidechain" signals are which is after the 22u/35v cap and before the 15k resistor. They lead to the two 47k resistors (which are before the side-chain VCA).
Those two 47k resistors are easy to spot on the pcb. They are on the left top corner off the left VCA. Then folow the pcb trace back till you reach the 22u/35v cap and voila, that's the to side-chain connection..


thanks for your help-now everything works great-sidechan function is a killa!

now i am wondering about the voltage regualtor(7812) i used for the relais-it gets more then 70 degree hot-do i need to cool it?
Berlin, Germany

radiance

ssl external sidechain
« Reply #26 on: May 18, 2005, 02:02:56 PM »
Well, if it's getting hot, cool it.
Also, in case you did not know, you should not use the 12v from the ssl power supply.
Instead, use a separate power supply (you can use the same power transformer though).
"Knowing that you are dreaming, however, does not automatically guarantee full rationality.
Then again, being awake doesn't ensure good thinking, either." -  Lynne Levitan

digichild

ssl external sidechain
« Reply #27 on: May 18, 2005, 02:07:12 PM »
Quote from: "radiance"
Well, if it's getting hot, cool it.
Also, in case you did not know, you should not use the 12v from the ssl power supply.
Instead, use a separate power supply (you can use the same power transformer though).


of course i use seperate powersupply :wink:

but also the regualtors on the ssl board get hot-but not so hot...well i think i check the datasheet...
Berlin, Germany

matthias

ssl external sidechain
« Reply #28 on: May 18, 2005, 02:31:00 PM »
do you still use the small 78L12 ??

simply change it to a bigger 7812 in to220 size

and you shouldn't have a problem with heat anymore...
and don't forget the protection diode for the relais

digichild

ssl external sidechain
« Reply #29 on: May 18, 2005, 03:05:19 PM »
Quote from: "matthias"
do you still use the small 78L12 ??

simply change it to a bigger 7812 in to220 size

and you shouldn't have a problem with heat anymore...
and don't forget the protection diode for the relais


i am using  a Ta 7812 (from reichelt : µA 7812)not a 78L12...
and also the protection diodes...

i gets quite hot-but the datasheet tells up till 75 degree its ok...
Berlin, Germany


matthias

ssl external sidechain
« Reply #30 on: May 18, 2005, 05:45:18 PM »
there must be something wrong...  is the output voltage correct??

mat

digichild

ssl external sidechain
« Reply #31 on: May 19, 2005, 01:35:05 AM »
Quote from: "matthias"
there must be something wrong...  is the output voltage correct??

mat


yes correct...

the regualtor from the relais is driving 2 small relais (2xum) and the lamps from the apem switches...
the lamps are paralell to the coil of the relais-so when the button gets pushed the relais gets powered and the lamp burns...
the contacts from the relais are used for bypass mode and sidechain on/off...
Berlin, Germany

mike_relay

ssl external sidechain
« Reply #32 on: June 09, 2005, 11:04:17 AM »
I've been looking at the following high pass filter that Steffen has posted:


I was fooling with the idea of modifying it so that the filter can be used with an external sidechain as well. Instead of the 6 position switch I would use a five position one, and just have another switch to flip between internal/external sidechain.  Would I have to change the "SC return" part of the circuit?

Here is my edited schem:


Thanks,
Mike

mike_relay

ssl external sidechain
« Reply #33 on: June 10, 2005, 09:18:15 AM »
bump... (sorry, I'm itchin' to finish this thing)

gyraf

ssl external sidechain
« Reply #34 on: June 10, 2005, 10:08:21 AM »
..should work.. try it..
..note to self: don't let Harman run your company..

ssl external sidechain
« Reply #35 on: August 25, 2005, 04:45:52 AM »
hello my first post. I ordered a few boards and was curious if the internal filter schematic worked out for you? I'm having a hard time reading a few values. Would you be so kind to type them out?
Thanks in advance.

gyraf

ssl external sidechain
« Reply #36 on: August 25, 2005, 05:04:54 AM »
Hi Wig,

Welcome to GroupDIY..!

Here's my guesses at unreadables:

SC send series resistor: 100 Ohms

SC return and "to control amp" capacitors: 47uF/35V electrolytic

opamp: TL072 (or whatever you have..)

Jakob E.
..note to self: don't let Harman run your company..

Steffen

ssl external sidechain
« Reply #37 on: August 25, 2005, 06:16:21 AM »
Quote from: "gyraf"
Hi Wig,

Welcome to GroupDIY..!

Here's my guesses at unreadables:

SC send series resistor: 100 Ohms

SC return and "to control amp" capacitors: 47uF/35V electrolytic

opamp: TL072 (or whatever you have..)

Jakob E.


yepp, thats right. I originally used NE5532N for the opamp but any (audio) opamp should work fine...

steff

Greg

ssl external sidechain
« Reply #38 on: November 11, 2005, 12:15:36 PM »
hey Steffen:

I want to double check some resistor values on your schematic?

20K from input buffers?
10K feedback opamp 1?
72K opamp 2 inverting input? It looks like 12K but the 1/(RC) values only work out for 72K?
5.1K feeback opamp 2?

Thanks.
Greg Stein
New Orleans, LA

Steffen

ssl external sidechain
« Reply #39 on: November 13, 2005, 04:35:17 PM »
Quote from: "Greg"
hey Steffen:

I want to double check some resistor values on your schematic?


72K opamp 2 inverting input? It looks like 12K but the 1/(RC) values only work out for 72K?


Thanks.


it´s 12k.

f= 1/(2*PI*R*C)    :wink:


 

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