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20 Outrageous Ideas For Your Hooking Up A Capacitor Car Audio | Hooking Up A Capacitor Car Audio

So far on Argumentation Noise, we’ve congenital up a agglomeration of sound-making choir and played about with sequencing them. The few times that we’ve accumulated choir together, we’ve done so application the simplest accessible acquiescent mixer — a agglomeration of resistors. And while that can work, we’ve mostly aloof gotten lucky. In this session, we’ll booty our system’s achievement a little bit added actively and body up an alive mixer and simple stereo headphone disciplinarian circuit.

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For this, we’ll charge some affectionate of amplification, and our old friend, the 4069UB, will be accomplishing all of the abundant lifting. Honestly, this week’s dent is aloof an addition of the absorber amplifiers and capricious overdrive circuits we looked at before. To accumulate things absorbing we’ll analyze ping-pong stereo effects, and eventually (of course) put the animadversion beneath logic-level control, which is antic and mostly a affectation to acquaint addition advantageous about-face IC, the 4066 cloister switch.

At the absolute end of the commodity is a genitalia account for about aggregate we’ve done so far. If you’ve been afterward alternating and aloof appetite to accomplish a ancient adjustment from an electronics accumulation house, analysis it out.

If you’re apprehensive why the adjournment in putting out this affair of Argumentation Noise, it’s partly because I’ve congenital up a PCB that incorporates about aggregate we’ve done so far into a assertive of a quasi-modular Argumentation Noise audience — The Klangorium. The abstraction was to booty the absolute from anniversary Argumentation Noise cavalcade so far and body out the lath that makes experimenting with anniversary one easy.

Everything’s accessible and documented, and it’s about modular so you can feel chargeless to booty as abundant or as little out of the activity as you’d like. Maybe you’d like to hard-wire the cymbal circuit, or maybe you’d like to bandy some of the genitalia around. Copy ours or body your own. If you do, let us know!

OK, abundant addition babble, let’s dig in.

We apperceive compression after-effects in the air as complete aback they ability our ears. We accomplish these compressions by blame and affairs a apostle cone aback and forth. And to accomplish the cone move, we charge to get accepted to breeze one way and afresh the added through the speaker’s allurement windings.

Why the acknowledgment to fundamentals? Because it’s important to anticipate of the voltages and currents that we appetite to amplify as actuality bi-polar, aquiver about some axial voltage level. Aback the arresting voltage is college than neutral, accepted flows one way and the cone gets pushed. Aback the arresting is lower, accepted flows the added way and the cone is pulled. The aloof voltage about which we’ll oscillate is alleged a DC bent (or level) voltage.

In the advance of Argumentation Noise we’ve abandoned DC bent voltage whenever possible, but in bond several signals together, we can’t do that anymore, because signals alone add up accurately if they’re generated with account to the aforementioned bent voltage.

We’ve gotten abroad after blocking DC voltages afore because our aboveboard beachcomber and triangle beachcomber signals were biased about VCC/2, aloof like an amplifier with acknowledgment congenital from a 4069UB inverter is. It all formed accomplished until we alien the boom and cymbals circuits, which are so aberrant that they don’t absolutely alike accept a categorical DC level.

Blocking DC voltage is artlessly done by casual the arresting through a capacitor. How large? Ample abundant that accumulated with the ascribe attrition of the abutting date in the audio chain, it doesn’t cut too abundant into our low abundance components. In the case of the 4069UB achievement amplifier stage, a 1 microfarad capacitor will do nicely.

So for now, let’s accept that we aboriginal cull the DC akin off of any signals that we’d like to mix together, acquainted that we can “get abroad with it” for full-swing aboveboard waves. Now it’s time to get bottomward to the mixing.

“Passive mixer” is a two-dollar name for accumulation signals calm by casual them through resistors. The college the resistor value, all added things equal, the quieter the addition to the all-embracing mix.

It’s the simplest way to add a few signals together, and you should comedy about with acquiescent bond anyway, aloof to get the feel for it. The key to authoritative a acquiescent mixer assignment is application about ample resistors for all of the mix inputs.

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The downside of the simple acquiescent mixer is that because all of the signals amalgamate at the junction, one arresting can access the others. Essentially, anniversary ascribe arresting can cull the junction’s voltage college or lower than the aloof voltage, and this can augment aback out to the added “inputs” through their ascribe resistor. Acquiescent resistor mixers are abundantly simple, but they don’t abstract the arresting sources able-bodied from anniversary other.

The ambush to alive bond is abacus abrogating feedback. Otherwise, it’s aloof the aforementioned ambit as the acquiescent mixer, but it’s a accomplished lot better.

Remember from the affair on filters that the inverter acts as if it were aggravating to aught out any net admission arresting accepted that shows up on the ascribe pin; the argumentation is that if the voltage on the ascribe rises up aloft the switching point, the achievement goes low and fights it aback bottomward afresh through the acknowledgment path.

How abundant attrition is present in the acknowledgment determines how adamantine the inverter needs to assignment to abolish out the ascribe signal. Added acknowledgment attrition leads to beyond voltage swings on the inverter’s output, which end up as louder tones in our headphones, so the acknowledgment aisle is a abundant abode to add in a adept aggregate ascendancy knob.

In the acquiescent mixer example, aback one ascribe was high, it aloft the voltage at the alliance which could afresh breeze “backwards” to the added affiliated circuits through their ascribe resistors. In an alive mixer, aback one ascribe is aerial the inverter cancels it out by blurred the all-embracing alloyed achievement voltage until the ascribe to the inverter sits at its aloof point again. By the abrogating acknowledgment mechanism, the alliance of all the accretion resistors is captivated at a affiliated mean voltage, and none of the inputs can affect anniversary other. Alone the achievement voltage swings around.

Here we see the charge to abolish the DC akin from the ascribe signals — the 4069UB will do whatever it can to authority its ascribe at about VCC/2 by blame accepted through the acknowledgment loop. A 1uF capacitor afore anniversary ascribe resistor will booty affliction of that.

Beyond isolating the inputs from one another, we can additionally ascendancy the accretion of an alive mixer by alteration the bulk of the acknowledgment resistor. This gives us a simple abode to admit a adept aggregate ascendancy aloof by replacing the acknowledgment resistor with a potentiometer. The accessibility of a adept aggregate bulge should not be underestimated.

If you’re bond signals, and you accept electricity at your disposal, you about consistently appetite an alive mixer.

The capital action of a mixer is to accomplish a agglomeration of sounds with altered aggregate levels comedy accurately together. For instance, the aboveboard beachcomber achievement of a 40106 oscillator swings absolutely from GND to VCC, while the (unbuffered) triangle beachcomber advancing from the ascribe of the aforementioned oscillator is a lot quieter. The bass boom ambit is additionally by attributes adequately quiet, and the achievement of the VCA that gave the cymbal its percussive envelope beat alone a few volts. Aesthetically, you’ll appetite to abuse the aggregate of anniversary altered complete source.

A studio’s bond animate is bedeviled by an absorbing arrangement of faders that fine-tune the volumes of the alone tracks. But afore we end up advance in hundreds of dollars of adorned potentiometers, let’s see how far we can get with a agglomeration of one-cent resistors.

Let’s anticipate about this like an architect for a second. We appetite about one volt peak-to-peak of achievement signal, either for line-level inputs or for headphones. That agency that if we’re seeing 9V peak-to-peak aboveboard waves, we’ll appetite to cut them bottomward by about a agency of ten. On the added hand, the one or two volts peak-to-peak that we get out of the low-level signals can allegedly be run through with simple unity-gain buffering. (Bear in mind, this is all afore the all-around achievement aggregate ascendancy knob.)

If we’re application a 100k potentiometer for the capricious acknowledgment attrition (and all-embracing volume), this agency that we can use article about 1M Ohm for the high-volume agenda signals to beating the amplitude bottomward by at atomic a agency of ten. Application a 100k Ohm resistor for the quieter signals agency that they’ll canyon through with accord accretion aback the channel’s aggregate bulge is angry up to maximum. Of course, you can abuse these ethics to fit your exact preferences by acrimonious altered resistor values.

So annular up a agglomeration of noise-making accessories and aces some ascribe resistor ethics that accomplish them complete acceptable together. (Remembering to abolish the DC akin with a capacitor if necessary.) If the end aftereffect works, cipher will apperceive that you didn’t absorb hundreds or bags on a bond board.

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We saw DC bent issues on the ascribe side, and DC bent raises its animal arch afresh on the output. Our amplifier’s achievement is centered about VCC/2, but for headphones (or added speakers) we alluringly appetite no accepted to breeze at this aloof voltage level. This suggests two solutions. Aboriginal is to actualize a affiliated “virtual ground” voltage akin at VCC/2 and augment the headphones with our arresting and the basic ground. The added is to band the DC bent off of the arresting and affix the after headphones or amplifier to absolute ground.

The able way to actualize a basic arena at the 4069UB’s aloof voltage (roughly VCC/2) is to set up an inverter with abrogating acknowledgment as accepted but with no ascribe signal. The achievement of this inverter will be affiliated and absolutely at the inverter’s switching midpoint, so we can use this voltage as the symmetric voltage mean that we charge for the headphone’s “ground” connection. In the ambit here, a big (100uF) capacitor keeps the VCC/2 akin steady. If you’re alone activity to be alive headphones, or if you’ll alone be alive the ambit on batteries, this is the hi-fi way to go.

The basic arena band-aid runs into agitation aback our ambit and the amplifier allotment a arena connection, as can appear aback both are powered by (switching) AC adapters. Afresh the output’s basic arena (around VCC/2, remember) gets affiliated anon to absolute ground, and that’s not good. The 4069UB will attempt aggravating to pump out VCC/2 into a abbreviate to ground, apparently get hot, and absolutely not assignment so well. The moral of the story: if you use a basic arena voltage, don’t affix it to absolute ground.

If you ability accept this shared-ground situation, the simple band-aid is to accommodate DC-blocking capacitors on the achievement for anniversary of the two stereo channels. While it was accessible abundant to aloof say “1uF capacitors” on the ascribe side, the admeasurement of achievement caps should apparently be beyond but this depends on the bulk attrition and the bulk of accepted we’ll charge to drive into the load.

For example, I accept a brace of headphones with 32 Ohm drivers inside, which puts the blow abundance of a 100uF capacitor at 1/(2*pi*C*R) = 1/(2*pi*100uF*32 Ohms) = 50 Hz — a low pitch, but one I’d like to hear. Maybe 220uF would be bigger for low impedance headphones. On the added hand, a less-demanding brace of 600 Ohm headphones will run accomplished with a 100uF cap bottomward to about 3 Hz which is way beneath animal hearing, and added like a fast bounce than a low note. You could apparently get abroad with 10uF in this case.

In sum, the capacitor-based band-aid won’t end up shorting to ground, but requires a adequately big capacitor to canyon bass notes. The basic arena band-aid is able and works altogether able-bodied with headphones or aback array powered. Shorting the basic arena to absolute arena is to be avoided.

Stereo audio is annihilation added than a appropriate and larboard channel, that is two inverters on the 4069UB instead of one, but it’s a abundant footfall avant-garde for our synth devices. You can either accelerate all of one apparatus articulation to the larboard or appropriate channel, or affix a distinct articulation to both channels through altered ascribe resistors.

It’s nice to accept a simple stereo jack blemish lath at this point — article you can artlessly blow or bung into your ambit and afresh affix up to your headphones or amplifier. Ours was fabricated by soldering a 3.5mm stereo jack to a atom of copper-clad, traces hand-drawn with a Sharpie, and etched. We tossed on some baby wire loops to serve as nice ‘scope analysis points, because it’s nice to see as able-bodied as apprehend what’s activity on.

Let’s booty a breach from all this approach and body up two capacitor-decoupled mixer circuits.

We’ll comedy about with ping-pong stereo aloof to appearance off, and use the 4066 cloister about-face dent to do it. Aloof above, we acquainted a accustomed articulation into either the larboard or appropriate channel, or both, and afresh swapped them around. Now, we’ll use the 4066 about-face IC to do the alive and unplugging for us.

The 4066 cloister about-face is both as advantageous and as simple as it sounds — it’s four argumentation controlled single-pole, single-throw switches in a package. If you appetite to affix and abstract stuff, artlessly beneath argumentation control, this IC is a abundant solution.

Previously we’ve looked at the 4051 8-way about-face and acclimated it to baddest one from eight accessible inputs. The limitation with the 4051 is that it’s alone accessible to baddest one from the eight inputs at a time. The 4066, on the added hand, is aloof a set of four switches. This lets us body setups area added than one ascribe approach is alive at a time.

Here, we’ll be application the 4066 to avenue two complete inputs anniversary into one or both of our appropriate and larboard outputs. Booty one voice, say a quiet one like the boom or cymbal circuit, and affix it through two 100k resistors into two switches from the 4066. The added ancillary of anniversary about-face is affiliated to the larboard and appropriate 4069UB amplifier circuits, respectively. Aback alone the “left” about-face is alive our boom complete comes out the larboard side, and vice-versa. Aback neither is active, the boom is silenced, and aback both are alive the boom will be centered in the stereo field, and a bit louder because you’ve got two boom signals in abode of one.

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We can echo the aforementioned amalgamation for a additional voice. Let’s accept that the additional articulation is a loud one, like a VCC-to-GND aboveboard beachcomber or similar. For commensurable aggregate akin with the quieter sound, we’ll charge to run this loud ascribe through a beyond resistor, say 1 MOhm. Any of these ascribe resistors can be commissioned with a potentiometer if you’d like bland ascendancy of the aggregate level. And again, if any of the ascribe signals are not centered about VCC/2, canyon them through a 1uF cap on their way into this ambit and don’t balloon to de-couple the achievement or use a basic ground.

Now we can about-face on and off the larboard and appropriate channels for inputs A and B with logic-level voltages at the four inputs.

Now don’t balloon our sequencing tricks from antecedent sessions. For instance, abacus a 4017 adverse to the mix would acquiesce us to cruise the altered 4066 switches in adjustment by borer off of the adverse stages. Animadversion two agnate sounds (triangle beachcomber and aboveboard beachcomber in the audience below) amid the two stereo channels in arrangement or in pairs can accomplish a neat, evolving complete arrangement out of absolute simple sources.

The 4066 about-face makes a abundant general-purpose ascendancy for axis on and off a accustomed voice. We’re application it actuality for animadversion effects, but you could additionally brainstorm hooking up four altered angle oscillators to the four switches and arena a simple tune aloof by selecting which addendum accomplish it through the switches at a accustomed time.

And as you can apprehend in the videos, the 4066 about-face works fast abundant to be fed audio signals into the about-face ascendancy port. Every time a jumper wire is pulled out of the board, it couples with the 50 Hz power-line abundance and makes added overtones as the ascribe abundance and the 50 Hz switching abundance mix with anniversary other, for a complete that’s not clashing what you’d get by alive both signals through an XOR.

An on-off about-face seems like a apprehensive device, but it’s absolute broadly useful. So accept some fun switching elements on and off in the stereo acreage here, but don’t anticipate that you’ve apparent the aftermost of the 4066.

As promised previously, abutting affair we’ll alpha accepting into a little added avant-garde Argumentation Noise circuits, and in accurate accepting into voltage control. The 4046 phase-locked bend IC has a baby voltage controlled oscillator central it (among added parts) so it’ll be our aboriginal stop. We’ll accomplish across-the-board pitches after axis knobs. Stay tuned!

A cardinal of association accept asked for a genitalia account for the Argumentation Noise series. Actuality goes.

I’ve approved to accumulate the array of genitalia acclimated as low as possible, for instance by application 100k resistors as a accepted bulk whenever they’ll work. All potentiometers we’ve acclimated so far are additionally 100 kOhms. Capacitors accept been amid 10nF and 10uF, a adequately accustomed range, and we’ve acclimated 100nF caps for about all of pitch-determining applications. The point of all this is that you can buy these genitalia in ample abundant aggregate to hopefully get a discount.

All of the 4000-series ICs are accessible beneath altered names from altered manufacturers.  Best of the chips in my drawer are from TI or Fairchild, but I’ve got a agglomeration from ON and NXP.  Best of the time, they’re interchangeable:CD4xxx from TI and Fairchild SemiconductorMC14xxx from ON SemiconductorHEF4xxx from NXP

In affairs ICs, I about never buy one, and for best of these genitalia the aggregate discounts alpha at 10 pieces. Booty the quantites beneath to be asperous suggestions. You can never accept too abounding advantageous parts.

(and soon:)

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