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Diy stereo compressor

Diy stereo compressor

The situation is changing daily but so far we have been lucky enough that there has been no disruption to our US origin shipments, and only minor disruption to our shipments from Italy. We have a couple of pioneer's batch B1 Korg full kits left. Feedback has been very positive. If you don't want to wait a few more months for the pre-order to happen, this is your chance to grab one now. I have just soldered them, check the DC biasing and it was everything perfect according to spec.

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NO troubles. Sound is great and clean. Noise is very low. It was a good service. Diy Audio store is a great resource to the diy audio community. Having access to these hard to find JFEts has helped turn a new hobby into a full-blown addiction! Can't wait until the next shipment of hard to find, quality audiophile grade parts arrive. The chassis was very well built, particularly for the price and worked well for my purpose.

diy stereo compressor

I ordered the 10mm front panel and it gives the amp a very finished look. All the parts needed to make the crossover work in a neat package. I've had the base TU with Mundorf silver oil caps added for 2 years now. Everything pretty much settled. Was looking to buy those transformers only but never saw available until now thanks Jason Anyway, the improvement was immediate no break in needed.

As I've read before just more of what the is good at clarity, soundstage, tonal balance and accuracy. Great service! Parts arrived very quickly with everything accounted for.Thanks for your continued support during this difficult time.

Sorry for the inconvenience! This product is out of stock because, like all companies selling electronics parts, our supply chains have been disrupted by the coronavirus. We'll restock this kit as soon as possible, but unfortunately we don't know when that will be. Our thoughts are with our friends in China and around the world affected by the virus. With the OLA5, we've painstakingly recreated the LA-4's leveling behavior—including cloning the original opto cell after finding that no modern substitute would do—but that's where the resemblance to the LA-4 ends.

The OLA5's signal path is completely overhauled and upgraded. Modern Clarity or Vintage Tone. As with the EQP5 Equalizer Kit, you can choose between the Modern output stage for more transparency or the Vintage output for a thicker, more colored sound. If both outputs are installed, you can switch between them without any soldering. A Challenging, Rewarding Build. The OLA5 is our most complex kit yet, with over parts, and as such we recommend it for intermediate-to-advanced builders.

Vocals, bass, drums, room mics The compression itself sounded great — a slightly slower attack than some of the other comps, which served it well on sources like bass guitar — and the audio sounded good too I'm buying my review unit and adding the "vintage" option. The LDR is placed next to a light source driven by the level of the incoming signal. The louder the input signal, the brighter the light source, and the less resistance in the LDR.

As the LDR, which sits between the audio signal and the ground plane, drops its resistance it dumps more signal to ground, reducing the output level. This is the basic functionality of optical dynamics processors. Light dependent resistors have a memory, so to speak.

The longer they are exposed to light, the longer they will hold their lower resistance. As a result, the release time of optical limiters is non-linear in a way that is pleasing to the human ear. It is largely for this reason the classic LA-type leveling amps have earned their beloved, classic status. No, while the OLA5 replicates the compression character of the LA-4 exactly, it has a different signal path and therefore a different sound.

diy stereo compressor

The beauty of the classic LA-type leveling amplifiers of which the OLA5 is one is their broadly musical touch and functional simplicity just reduction and gain makeup knobsmaking it easy to get great results without much fiddling. The OLA5 is very forgiving and sounds great with broad variety of source material though it absolutely rules on vocals, acoustic and bass guitars. This mode is perfect for general leveling of all kinds of material.

Engage the LIMIT switch, and the ratio switches to either or user programmable via a jumper on the motherboard with a higher threshold setting. LIMIT mode excels at heavier processing duties where users prefer to… well… limit the dynamic range of a signal in a more heavy handed way. This output, first offered with the EQP5, is based on the output stage of the original solid state Pultec equalizers from the s, and provides a wonderfully sweet, vintage heft to your signals.Do-it-yourself kits are becoming more and more common in the audio community, especially among the more ambitious—and more thrifty—among us.

With a bit of time and focus, you can wind up with professional-grade audio equipment worth much more than the literal sum of its parts. There is a very wide range of kits available, covering all your studio essentials from basic designs like re-amp boxes and DIs to complex compressors and summing boxes. Fortunately, DIYRE has bundled three of their entry-level projects together for a great introduction—and a very useful set of tools. The bundle includes full kits for a passive reamp box, a line level attenuator and a passive summing mixer.

All three boxes are built from durable aluminum, and are exceptionally handy to have around the studio. Austin Microphones specializes in DIY ribbon mic kits. Quality ribbon mics are a boon for many a studio situation and the Austin kits boast powder-coated brass bodies, hand-selected components, and a variety of transformer options, including Lundahl and Cinemag, to choose from. I contacted owner Rick Wilkinson, who gave some insight to this rather unique design:.

It also introduced some crosstalk as the signal ran past the bottom element and its strong magnets. Having both output transformers right next to each other in the bottom of the mic has some potential for crosstalk too.

Alternate Option: Any of the kits from Microphone-Parts. Seventh Circle Audio from Oakland, CA provides both kits and fully-assembled preamps and compressors. A rack full of Seventh Circle Audio preamps. Seventh Circle offer seven varieties of preamp, designed to fit in their proprietary 8- or 1-space chassis.

Their designs are patterned after classic preamps like the Neve and APIwith some models suitable for beginning builders and others best left for those with more experience.

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EQ: Don Classics Based on the legendary GML equalizer, the Don Classics is a mono, 2-slot series unit boasting all the transparency and surgical precision of its inspiration. The front panel shares that same inspiration as well: Five bands of fully-parametric EQ with familiarly colored knobs set the tone on a nicely-painted and silkscreened front panel. Of all the kits here, this is probably the most complex build, and with the loftiest goal as well.

The original GML is revered as a super-clean and flexible EQ, useful in both mixing and mastering applications. Andreas July 28, at pm 4 years ago.Audio compression is a signal processing operation that reduces the volume of loud sounds or amplifies quiet sounds thus reducing or compressing an audio signal's dynamic range.

Compression is commonly used in sound recording and reproduction, broadcasting, live sound reinforcement and in some instrument amplifiers. Here, we present a simple compressor circuit which is able to compress the dynamic range of any analog audio signal. The specific circuit does not amplify quiet sounds but it just compresses loud sounds. The simple compressor-limiter is an analog circuit and can be used to process only analog audio.

It can be adjusted to change the way it affect sounds through two potentiometers. It uses soft compression for middle-loudness sounds and hard-compression for very loud sounds, thus acting as a limiter for very loud sounds. Basically, when acting as a limiter, the circuit uses high ratio compression and fast attack time.

The simple compressor — limiter, was actually designed to be used in FM radio broadcasting, where fast attack time is crucial because the modulation index of any FM transmitter must be kept below a certain limit, otherwise some interference may occur to neighbor radio channels.

The simple compressor — limiter uses TL, which is a high quality dual operation amplifier IC. One op- amp of the TL is used to measure the level of the input signal and the other op-amp is used as a variable-gain amplifier. The measured signal level provides feedback, and above a certain threshold, it reduces the level of the variable — gain amplifier.

IC1-A is used as a typical non-inverting amplifier. IC1-B is a typical inverting amplifier which takes at its input the output signal of IC1-A, and amplifies it furthermore.

D1 and D2 form a rectifier. Together, with C8 and R7, are used as an RMS detector which produces a negative voltage which is roughly approximate to the audio sound level. The negative voltage which is produced from the RMS detector is applied to the gate of T1 and controls its drain — source resistance, which in turn, controls the gain of the variable-gain amplifier. As the sound level increases, the negative voltage produced by the RMS detector increases.

As this negative voltage increases, the drain — source resistance of the T1 also increases and lowers the gain of the variable — gain amplifier. This operation reduces the volume of the loud sounds and compresses the dynamic range of the audio signal.

Thus, R7 can be used to adjust the speed of the compressor and R11 can be used to adjust its threshold. For a junction field-effect transistor JFET under certain operating conditions, the resistance of the drain-source channel is a function of the gate-source voltage alone and the JFET will behave as an almost pure ohmic resistor. If the gate voltage is increased negatively for n-channel JFETs and positively for p-channelthe resistance will also increase.

When the drain current is reduced to a point where the FET is no longer conductive, the maximum resistance is reached. Thus the device functions as a voltage- controlled resistor. Figure 2 details typical operating characteristics of an n-channel JFET.

Most amplification or switching operations of FETs occur in the constant-current saturated region, shown as Region 2. A close inspection of Region 1 the unsaturated or pre-pinchoff area reveals that the effective slope indicative of conductance across the channel from drain-to-source is different for each value of gate-source bias voltage.

The slope is relatively constant over a range of applied drain voltages, so long as the gate voltage is also constant and the drain voltage is low. The last observation is an essential detail which is taken into account in our compressor design in order to avoid any signal distortion:. It is obvious from figure 2 that bias lines bend down as VDS increases in a positive direction toward the pinch-off voltage of the FET.

The bending of the bias lines results in a change in rDS, and hence the distortion encountered in VCR circuits. We use both of the above techniques in our simple compressor- limiter circuit. R1 and R2 form a voltage divider which acts as an attenuator.

The attenuator reduces the input signal level by 33db, in order to keep the drain - source voltage of T1 within safe limits.


C6 and R5 form a negative feedback network which applies a part of drain voltage to the gate. During positive signal cycles, this causes the channel depletion layer to decrease, with a corresponding increase in drain current. Increasing the drain current for a given drain voltage tends to linearize the VGS bias curves.

On the negative half-cycle, a small negative voltage is also coupled to the gate to reduce the amount of drain-gate forward bias. This in turn reduces the drain current and linearizes the bias lines.Posted: Mon Dec 06, am.

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Matt: I guy at work who is sound man for a number of commercial groups in Melbourne has asked me to make a tube compressor for him. This is the only schematic I and others have been able to come up with. At a guess what would you expect the HT to be. I think quite low volatge e.

Would you please make an educated guess for me. I have started building the cct. I may have the cct. Also can you suggest a method by which I can simply test that the HT is "about" the correct value e. Post subject: Re: A Tube Compressor for the common man. Posted: Tue Dec 07, am. It's surely an interesting approach to building a compressor. The normal approach to volume compression or expansion is to run the signal into a detector and use the output of the detector to modulate an amplifier.

It looks like whoever designed this circuit was trying to make do with what they had.

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So, I'll explain how I interpret the circuit and see if anyone has any additions or corrections to what I have to say. The first tube looks to be doing two functions. The cathode is then AC coupled to the input of a diode detector formed by shorting the right hand triode grid and plate together. The detector decay will be tuned with the adjustable RC pair on the output. I believe that the first triode is running in a very nonlinear fashion just to drive the detector.

The second tube is more confusing. The input is clearly another cathode follower with an adjustable load. The adjustment seems to be used to set the bias point of the other triode which appears to be a simple common cathode amplifier. Now comes the confusing part. But maybe the 12AX7 is cleaner in the lower corner then I thought.

diy stereo compressor

I just don't know. So overall, I guess the circuit kind of makes sense. But I would have to do some more rigorous circuit analysis to be certain. You should be able to power it up with just the left hand tube in the circuit to verify the detector operation.

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Then power it up with just the right hand tube to verify the amplifier stage at least that's how I would approach it. The use of the 12AX7 is interesting here. This is the exact function for which the 6AT6 and 6AV6 were designed. I'm kind of surprised that no one could find a circuit using one of these tubes. They were widely used in vacuum tube car radios in the s and s. Does anyone else have anything to add? Or correct. I made a lot of assumptions in my analysis and I have to admit that vacuum tube detectors are not exactly my strong suit.The partnership, based on a passion for quality design, has yielded some of the best DIY projects on the market today.

These kits include only the highest quality USA made custom enclosure and transformers. All components are carefully selected by ear to match the original units and create the most authentic recreation available on the market. The new PCB design is a nod to the classic layout. The audio transformers now mount directly onto the main PCB.

The attack and release network, previously the trickiest wiring in the build, is now on its own small PCB that easily mounts to the main board with the supplied connectors. A standard in pro-audio, JST connectors have allowed us to eliminate the complicated wiring. What little is left is made simple with pre-assembled connectors. The wiring of the kit, which used to take several hours, can now be done in only a few minutes. Our transformers, custom designed by Ed Anderson, are meticulous recreations of the original UTC input, output transformer, and power transformer.

Modern recreations from larger transformer winders tend to focus on improving specifications, which washes out the original character and tone that made these compressors so famous. We spent weeks listening to original units and auditioned almost capacitors to select a compliment of authentic sounding components.

Our focus was not to manufacture products overseas in places such as China to keep our costs low. Rather, our focus is to provide only the best parts available and to never compromise. Hairball Audio prides itself in creating the highest quality kits, while keeping design elegant and simple. Shop Now. Transformers: Our transformers, custom designed by Ed Anderson, are meticulous recreations of the original UTC input, output transformer, and power transformer. Sound Library Listen in.

Build Guides Yes, you can with our step by step build guides. DIY Community User photos. Sign me up.Show 20 Show 40 Show 60 Show 80 Show All times are GMT. The time now is PM. Resources saved on this page: MySQL User Name. Stay logged in? Mark Forums Read. Please consider donating to help us continue to serve you. General Interest.

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Balanced B1 with Korg Triode. The amazing fallacy of High End stuff