![pink noise truerta pink noise truerta](https://www.soundstagesolo.com/images/stories/features1/201806_tips2.png)
While you're at Rod's site, check out his amazing tutorials and projects. You can locate the program at the very bottom of this page: Go to his website ( ) and grab this tool if you're interested in this kind of stuff.
#PINK NOISE TRUERTA SOFTWARE#
It's worth mentioning that Rod Elliot (ESP) has a sweet little piece of software that does these calculations for you.
![pink noise truerta pink noise truerta](http://www.blackstrat.net/FQN/BANDED_PINK_NOISE.jpg)
#PINK NOISE TRUERTA SIMULATOR#
The simulator gives some pretty crazy predictions if you lower the values too much-as in the waveform distortion is ridiculous-so keep an eye on that oscilloscope. In fact, the only coupling cap is the 10uF fellow trailing the output buffer (which is a source follower ZVN-3310 direct coupled to the third differential).įYI: The source degeneration feedback resistor values can be altered to adjust overall gain, so if you want more gain, lower the values of the resistors. The beauty of this arrangement is that I can use the x-over filter from the prior stage to bias the mosfet stages, this way they're direct coupled. The second and third differentials are based on the ZVN-3310 mosfet utilizing a fair amount of source degeneration (feedback). In the schematic, you'll notice that I didn't add a cap/ground resistor to the input-it is advisable to add them when coupling to amplifiers that don't have output caps and/or have DC at the output. Truth be told, I used this transistor for all the Constant Current Sources in this circuit. The Constant Current Source is made from the same j310 transistor. For the first differential pair, their Ciss is a bit higher than the j310, but still less than the ZVN-3310 mosfets (which make up the next two differential stages), so again, don't fret. They seem perfect as a constant current source. Mouser has a truckload of PF5102 jfets in stock, and they're brutes that sell at $13.40 per hundred.
![pink noise truerta pink noise truerta](https://s1.manualzz.com/store/data/007286466_1-17e09ce88e1e6ff4f18f1e3872fb2ef9-360x466.png)
There's plenty of modern jfets that will work in this circuit. It's extremely easy to work with, affordable, and plentiful-or at least it was, I see that Mouser only has 33,000 OnSemi devices in stock and that it's an end-of-life item. If you hurry, you can still get 100 pieces for $15.00.įYI: HEY, don't fret if they sell out. Beginning from the left, the first of three differentials is based on the J310 jfet. This extremely simple circuit is all differential, except for the lone output buffer on the right. ?I begin with my first building block: the 135 hz low pass portion of my crossover: ? Things won't always be perfect, and you may never get it perfect, but if you don't try, YOU'LL NEVER KNOW. Nothing on this page is gospel (but I wouldn't post an untested idea), and I'm always open to fair minded criticism, thus will make corrections as the situation demands.Īs you will see, when i get the itch to do something, I just get the parts, toss them in the cauldron and stir like crazy! I find that if you spend too much time contemplating, you may run out of passion and never get the first breadboard stuffed. With all that being said, this is an ongoing saga of my quest to develop a basic, easy to fabricate, discrete electronic crossover with no interstage coupling capacitors (unless they're part of the crossover's filter network). I mean, after all, there are many circuits that require op-amps, so why not build your own DIY op-amps, right? And if you can build your own op-amp, why not build something bigger-like an electronic crossover?!? Yes, this article transformed my thinking. One could add another transistor to the differential's output to get more gain, or additional current, and there were the four basic types of amplifying devices to tinker with: bipolar, jfet, mosfet, and tubes-and, hey, he threw in a section on constant current sources as well. I remember a tutorial Nelson Pass posted-one of many-and in this particular article on DIY op-amps (look for it), he went on to describe a simple circuit that consisted of little more than a differential amplifier.