BAJA Optical Limiter revisited - rev2 [documentation]
- seedseed
- Breadboard Brother
Hi everyone, I play bass and know this would be a great limiter for bass but has anyone used if for a pa application as in betweent the preamp and the main amp for a pa as i reckon it would work great but i thought i would ask the question if anyone else has tried that with this unit. I can't see why it wouldn't respond well but i guess the only way to find out is to try it. Could someone please let me know otherwise thanks
hi!
im wondering where are the project files, because i tried to enter this page members/bajaman/Baja/Baja%20Optical%20Limiter%20rev2/
and nothing!
could you upload the files somewhere else? thanks!
im wondering where are the project files, because i tried to enter this page members/bajaman/Baja/Baja%20Optical%20Limiter%20rev2/
and nothing!
could you upload the files somewhere else? thanks!
- coldcraft
- Diode Debunker
diegoribba wrote:hi!
im wondering where are the project files, because i tried to enter this page members/bajaman/Baja/Baja%20Optical%20Limiter%20rev2/
and nothing!
could you upload the files somewhere else? thanks!
members/bajaman/Baja/Baja%20Optical%20Limiter%20rev2/
works for me
Black Dynamite wrote:you need to shut the fuck up when grown folks is talkin.
- bajaman
- Old Solderhand
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I guess so as long as it is running from a low impedance source - Pete Cornish likes double buffering though, so may be beneficial left in - you can use many other jfets as buffers though - may have to alter source load resistor to compensate - will give varying current draw which may extend or reduce high frequencies and distortion products when overdriven
bajaman
bajaman
be kind to all animals - especially human beings
- theehman
- Diode Debunker
Information
Is there a new link for the parts list, photos, PCB, etc?
Ron Neely II
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs
Thanks bajaman!
- bajaman
- Old Solderhand
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- Posts: 4549
- Joined: 26 Jun 2007, 21:18
- Location: New Brighton, Christchurch, NZ
- Has thanked: 595 times
- Been thanked: 2056 times
thanks lietuvis
be kind to all animals - especially human beings
- Ihunda
- Breadboard Brother
Great bajaman!
Could you explain how the two 1N4148 diodes to on the last opamp before the LDR led?
Are they just here for a 1.4V reference? I am not sure if that opamp just adds gain or if it also works as a comparator?
Many many thanks in advance
Could you explain how the two 1N4148 diodes to on the last opamp before the LDR led?
Are they just here for a 1.4V reference? I am not sure if that opamp just adds gain or if it also works as a comparator?
Many many thanks in advance
- Ihunda
- Breadboard Brother
Well I am answering myself
After looking around for info, this looks like a differential amplifier and the diodes make a up a 1.4V reference voltage that is subtracted from the control signal, which is an amplified version of the input signal.
This way, the LED/LDR lights up when the signal becomes higher than the limit...
After looking around for info, this looks like a differential amplifier and the diodes make a up a 1.4V reference voltage that is subtracted from the control signal, which is an amplified version of the input signal.
This way, the LED/LDR lights up when the signal becomes higher than the limit...
- Intripped
- Cap Cooler
I'm studying this circuit, trying to understand the side-chain part as well.
i've found other schems in which the signal is usually rectified in order to convert it in a DC signal and control the opto-LED lighting,
(using one of these circuits: http://sound.westhost.com/appnotes/an001.htm)
but here i don't understand exactly what is going on... ihunda could you please explain it more in detail?
is the signal rectified or not?
i've found other schems in which the signal is usually rectified in order to convert it in a DC signal and control the opto-LED lighting,
(using one of these circuits: http://sound.westhost.com/appnotes/an001.htm)
but here i don't understand exactly what is going on... ihunda could you please explain it more in detail?
is the signal rectified or not?
Hi,
Just finished this proyect, and it's nice!
A lot of gain and clarity!
However I want a little more of limit. I got the Limit pot full and I think I need a little more.
What can I do? Any resistor change to get a more brightness led in the LDR?
Thanks!
Just finished this proyect, and it's nice!
A lot of gain and clarity!
However I want a little more of limit. I got the Limit pot full and I think I need a little more.
What can I do? Any resistor change to get a more brightness led in the LDR?
Thanks!
- aion
- Solder Soldier
Information
http://www.alliedelec.com/images/produc ... 136790.pdf
Would this be a good optocoupler for this project? On is 60R min/150R typical, off is 25M max. Although, I am not sure what to look for with the rise time.
Would this be a good optocoupler for this project? On is 60R min/150R typical, off is 25M max. Although, I am not sure what to look for with the rise time.
Information
- Posts: 35
- Joined: 16 Nov 2008, 21:55
- Completed builds: EH Bassballs | Whooly Mammoth | Orange Squeezer | OnBoard-Parametric-EQ | asmm
I need help, please.
Build this thing following Bajaman's layout and schem. Connected it - it's motorboating. Very loud!
Looked for mistakes. Recognized that the 1N4148 diodes are reverse polarity in the schem and the layout. Corrected and connected again - motorboating.
Drew a new schem from the layout to control the differences. Everything seems right, except the diodes.
Opened the tube of the LED and the LDR to look if the LED works. Connected - motorboating. This time I can play with it dancing in front of the LDR.
Again controlled everything, reversed the polarity of the diodes again and gave it a try without them - motorboating, even when the switch ist off.
No idea what to do anymore...
Anybody?
Build this thing following Bajaman's layout and schem. Connected it - it's motorboating. Very loud!
Looked for mistakes. Recognized that the 1N4148 diodes are reverse polarity in the schem and the layout. Corrected and connected again - motorboating.
Drew a new schem from the layout to control the differences. Everything seems right, except the diodes.
Opened the tube of the LED and the LDR to look if the LED works. Connected - motorboating. This time I can play with it dancing in front of the LDR.
Again controlled everything, reversed the polarity of the diodes again and gave it a try without them - motorboating, even when the switch ist off.
No idea what to do anymore...
Anybody?
Information
- Posts: 35
- Joined: 16 Nov 2008, 21:55
- Completed builds: EH Bassballs | Whooly Mammoth | Orange Squeezer | OnBoard-Parametric-EQ | asmm
And again...
Checked everything. Changed the ICs. Measured the voltages and all components. Checked for shorts and breaks. Still the same.
It is generating a really loud signal like an oscillator depending on the LDR's resistance. If it's dark the signal ist about a few Hz; in the sunlight it goes up until about 3kHz. The LED flickers simultaneous.
Could somebody please give me a hint what to check else?
Checked everything. Changed the ICs. Measured the voltages and all components. Checked for shorts and breaks. Still the same.
It is generating a really loud signal like an oscillator depending on the LDR's resistance. If it's dark the signal ist about a few Hz; in the sunlight it goes up until about 3kHz. The LED flickers simultaneous.
Could somebody please give me a hint what to check else?