joaquins said:Second, if you have something connected at the instrument input and activate the noise you would feed the noise to the instrument (or whatever you connected to it) You could call it a feature but I'm concerned if you connect a line driver with low output z it might bring some problems.
merlin said:What average voltage are you getting at pin-10 of the pink noise opamp? Reason I ask is that the reverse voltage of the PN junction is not guaranteed, so it might be outside the common-mode range of the opamp? In which case you'll need to feed it through a coupling cap and bias resistor to the opamp.
If you are only using a single supply and connecting pin 11 to 0V , you can not also connect op amp inputs like pin 5 to 0V . Connect pin 5 to v/2 at + end of C2.pablobolche said:I have attached a picture of what happens...
This is for stage use....I would call it a feature as you say...to troubleshoot stuff on stage....same goes for the leds in the PSU....
100R resistors are to be changed to the highest value that triggers the PSeudo White Noise.....
These are some DC volts of the circuit...
+V 10V
PIN 10 9V
PIN 5 0V
In normal operation I get
PIN 6 when I conect the Multimeter it Measures 9V and goes fairlyfast to 8.5V
PIN 7 9.5V
PIN 8 9V
If I disconect conections to pin6 I get 0.5V
Still working on some values that need changing....and not sure it is doing what it should...
Well there's your problem -the opamp is saturated.pablobolche said:These are some DC volts of the circuit...
+V 10V
PIN 10 9V
PIN 5 0V
In normal operation I get
PIN 6 when I conect the Multimeter it Measures 9V and goes fairlyfast to 8.5V
PIN 7 9.5V
PIN 8 9V
This. And couple the PN junction to the opamp using a cap and bias resistor/s. Also you appear to be missing an input resistor to pin-6 (pink filter opamp). Basically, your current circuit does not match what you originally posted.If you are only using a single supply and connecting pin 11 to 0V , you can not also connect op amp inputs like pin 5 to 0V . Connect pin 5 to v/2 at + end of C2.
Great...I willJohnRoberts said:If you are only using a single supply and connecting pin 11 to 0V , you can not also connect op amp inputs like pin 5 to 0V . Connect pin 5 to v/2 at + end of C2.
JR
merlin said:Well there's your problem -the opamp is saturated.
This. And couple the PN junction to the opamp using a cap and bias resistor/s. Also you appear to be missing an input resistor to pin-6 (pink filter opamp). Basically, your current circuit does not match what you originally posted.
joaquins said:I don't know the electret amplifier, for sure there are better 3 transistors circuit but I have no real experience with them.
JS
pablobolche said:This is for stage use....I would call it a feature as you say...to troubleshoot stuff on stage....same goes for the leds in the PSU....
100R resistors are to be changed to the highest value that triggers the PSeudo White Noise.....
...
pablobolche said:Other stuff in my mind is...The limit for phantom power is 8mA @48v?!!correcto??....If I work internally at 12v I can use 32ma??
pablobolche said:Other stuff in my mind is...The limit for phantom power is 8mA @48v?!!correcto??....If I work internally at 12v I can use 32ma??
Longer answer, with Phantom Power each of the signal leads is connected to 48V [this could be a lot lower voltage on some cheap pres/mixers, but ignoring that], in series with a 6.8k resistor. Thus if you short these to ground, you get 7mA each or a total of 14 mA. Of course, at zero volts you won't get any power out.Gene Pink said:Short answer, no.
Think of phantom as "soft power", where as soon as you put any load on it, the voltage drops, a lot.
From memory, in order to pull the most power in watts from phantom, I believe it needs to be loaded down to near 28 volts
Gene
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