Yamaha - NE-1 Parametric Equalizer [schematic]

[OldMan]

If you plan to build a NE-1, you may find this version interesting.

The Q control varies continuously and a switch changes the filter to low-pass.

yamaha ne-1 (SF remix).gif

Thanks!
Why did you raise R2 to 1M ?

[Silent Fly]

If you plan to build a NE-1, you may find this version interesting.

The Q control varies continuously and a switch changes the filter to low-pass.

yamaha ne-1 (SF remix).gif

Thanks!
Why did you raise R2 to 1M ?

To increase the input impedance. Some passive basses might sound better with higher input impedance. In practice probably it makes no difference.

[Silent Fly]

Thanks vor explaining

Perfboard anyone?

Cool - Thanks.

Not to be difficult but I would call it "smooth Q control" (or something similar) instead of "Yamaha NE1 with Q control". The NH-1 has variable Q as well but with only 2 settings.

[OldMan]

Thanks vor explaining

Perfboard anyone?

Cool - Thanks.

Not to be difficult but I would call it "smooth Q control" (or something similar) instead of "Yamaha NE1 with Q control". The NH-1 has variable Q as well but with only 2 settings.

Ok lets call it "NE1 with continuous Q control"

[Silent Fly]

Ok lets call it "NE1 with continuous Q control"

[OldMan]

Here is also the "Original" (lietuvis DimebuGG , george giblet, lolbou - Version) Perfboard:

http://www.untrue.ch/test/ne-1/


@lietuvis, DimebuGG , george giblet, lolbou, and Silent Fly

Did you allow me to put your schematics on my Page?

[lolbou]

Here is also the "Original" (lietuvis DimebuGG , george giblet, lolbou - Version) Perfboard:

http://www.untrue.ch/test/ne-1/


@lietuvis, DimebuGG , george giblet, lolbou, and Silent Fly

Did you allow me to put your schematics on my Page?

Ok for me! Free for all!

[gkoerselman]

Here is my PCB layout (300 dpi with schematic and component layout).

Not verified yet, so please let me know of any errors or improvements.

(Send me a PM with your e-mail address if you want my Eagle files)

[gkoerselman]

I just finished building the above and the switch lugs are labeled wrong. To correct, S1A needs to be swapped with S1C (or S2A with S2C). This will look like the following when using a ON-OFF-ON switch with 2 poles:

S1A S2C
S1P S2P (<- poles)
S1C S2A

I used a 25k log pot for the level (as I couldn't find a 20k one) and this needs to be maxed to get unity gain.

Thanks again for the schematic and the work (Silent Fly, lolbou, lietuvis, george giblet and DimebuGG)!

[DimebuGG]

Bump!

What could be a possible mod on this for guitar usage?.

[Silent Fly]

Bump!

What could be a possible mod on this for guitar usage?.

I am not sure how it would sound with a guitar but I wouldn't change anything.

[ric3xrt]

My appolagies from digging up this thread, does it matter what Volt Rating the caps are?
Ie : 100NF 63V (or 100NF 25V) agian newbe here with what most might think is a simple Q:
I'm building a Bass preamp and want to incorporate this into it.

[deltafred]

My appolagies from digging up this thread, does it matter what Volt Rating the caps are?
Ie : 100NF 63V (or 100NF 25V) agian newbe here with what most might think is a simple Q:
I'm building a Bass preamp and want to incorporate this into it.

25V caps will be fine, it is designed to run on a 9V battery so that is the maximum any component will be subject to.

How did you get on building your bass preamp? That is exactly why I was looking at such circuits.

[Duckman]

I can see a "Q-BM" in my future

[allan_belt]

Hello from Peru i `m a little bit confused about the switch

I just finished building the above and the switch lugs are labeled wrong. To correct, S1A needs to be swapped with S1C (or S2A with S2C). This will look like the following when using a ON-OFF-ON switch with 2 poles:

S1A S2C
S1P S2P (<- poles)
S1C S2A

I used a 25k log pot for the level (as I couldn't find a 20k one) and this needs to be maxed to get unity gain.

Thanks again for the schematic and the work (Silent Fly, lolbou, lietuvis, george giblet and DimebuGG)!

Are the labels on the layout wrong?? or am i wrong??

[pedalgrinder]

Do you know what would make this really good for bass so you can filter the notes to be difined and clean is to run a variable high pass filter first before this one. Reason being most guitars and basses give off unneccessary frequency that human ears don't detect generally and basically just push the speaker to extend cone throw excursion. You want your speaker on a bass majoritly to be puching out the notes you pluck not crap. So if you put a high pass filter before it from say 20hz to 200hz that variable this will clean it up. Don't expect miracles it's not about that it's just cleaning out unnecessary frequencies on bass. Making it adjustable is what the beaurty of it is you adjust to taste. then your other filter may work well the standard way or modded. pretty much a suck it and see approach. Here's a schematic i found good. A lot of double basses have been using this for years in the fishman stuff. It still works well for electric bass also.

20Hz-to-200Hz-variable-high-pass-filter.gif (8.74 KiB) Viewed 3363 times

OverviewThe circuit was designed to create a high-pass filter that can be variably change to work with frequency range from 20 Hz to 200 Hz.

Terminology◦High Pass Filter – an electronic circuit that allows the passage of high frequencies while opposing any unwanted low frequency components
◦TL072 – a low noise JFET input operational amplifier with features such as common-mode input voltage range, high slew rate, operation without latch up, compensated internal frequency, high input impedance at the JFET input stage, low noise, low total harmonic distortion, protected from output short circuit, low input bias and offset currents, wide common-mode and differential voltage ranges, and low power consumption
Circuit ExplanationThe operation of the high-pass filter in a stereo system is represented by the functionality of a tweeter where a capacitor is connected in series as it provides the treble audio to the speaker. It has a rated cutoff frequency that is above which the output voltage increases above 70.7% of the input voltage.

A high-pass filter circuit is typically constructed using the series combination of a capacitor and a resistor known as RC circuit. It can also be constructed using inductors and capacitors that are arranged in either a T or a pi network.

This variable high-pass filter circuit is also known as low-cut filter operates in the frequency range of 20 Hz to 200 Hz which covers a part of the extremely low frequency (ELF) and a part of super low frequency (SLF). It can be used to provide more details of sound signals. The two 47K ohms potentiometers are used to regulate the frequency response as it is produced in the two extreme points.

ApplicationIn general, high-pass filters can be used as part of an audio crossover guide the high frequencies to a tweeter while preventing the passage and interference of bass signals which could damage the speaker. Other types of high-pass filters like the rumble filters are used in tape decks and record players to remove the unwanted sounds near or below the lower end of the audible range like the noises coming from motors or footsteps. In the amplifier input and output, high-pass filters are also used for AC coupling.

[lietuvis]

Made this for friend