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Old 14th October 2012, 08:20 PM   #1
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Default BK Electronics Pear Drop Class D...

Any thoughts on this amp?

Pear Drop

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It looks interesting at least.


Last edited by aquapiranha; 14th October 2012 at 11:19 PM.
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Old 14th October 2012, 08:26 PM   #2
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First time i see phase shift modulation used outside of switchmode power supplies.
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Old 15th October 2012, 11:19 AM   #3
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Default what's inside

Seems to me an Abletec ALC-180 module is inside.

Integrated Audio Power ALC0180

The ALC180 is designed to meet the high requirements from manufacturers of state-of-the-art consumer and professional electronics, where audio performance and system integration is key. The ALC0180 comes as an open frame unit making it easy to integrate into a wide range of product from active speakers through to home audio products. The ALC0180 offers both stereo and bridged mono configuration for maximum flexibility.

The module is based on a phase shift modulated topology with advanced protection circuitry. This topology shows very low distortion figures and because of its simplicity and robustness the finished products are very attractive both when it comes to functionality and cost.

A powerful switch mode power supply giving 180Wrms power with 360W peak output power for short periodsof time to cover the reality of music. The power supply is inherently designed for ultra low noise making it well suited to the demands of audio and consumer electronic products. It also delivers +/- supplies to an external PCB, for example a cross over board or pre amplifier board in a dual mono integrated amplifier.

The built in over current protection has two modes. During transients into the current limit threshold it allows constant output current but if this condition persists it goes into burst mode. This guarantees that the amplifier does not create audio holes during heavy listening but still effectively protects it during short circuiting. The thermal protection contains a sensor connected to the very tab of one of the output devices of time to cover the reality of music. The power supply is inherently designed for ultra low noise making it well suited to the demands of audio and consumer electronic products. It also delivers +/- supplies to an external PCB, for example a cross over board or pre amplifier board in a dual mono integrated amplifier. The built in over current protection has two modes. During transients into the current limit threshold it allows constant output current but if this condition persists it goes into burst mode. This guarantees that the amplifier does not create audio holes during heavy listening but still effectively protects it during short circuiting. The thermal protection contains a sensor connected to the very tab of one of the output devices giving a very fast detection and shut down at over load.

The IC used in the module is a IRS20955S based IC by IR, it is custom made IC made for Abletec/Anaview. Circuitry used in this module is patented and is owned by Patrik Boström from Anview AB, the patent reference number is WO2010126440A1.
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Last edited by wimdehaan; 15th October 2012 at 11:39 AM.
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Old 15th October 2012, 03:23 PM   #4
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Thanks! So, is that good then??
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Old 15th October 2012, 03:48 PM   #5
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Ah i know Anaview, they contacted me once with a job offer a few years ago, but at the time i wasent ready to move south.
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Old 15th October 2012, 05:07 PM   #6
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Quote:
Thanks! So, is that good then??
I am using an ALC-180 based amplifier for daily use and I am very happy with it.

It feels the B-K is a bargain. I did pay for the module itself something like 95 euros and I am using an HiFi-2000 enclosure which sells for 45 euros or so. The B-K sells for 199 $US, approx. 155 euros and it looks great.

Must say I did replace the origional input opamp (MC33078) for an OPA2604, it feels it makes it even better (better soundstage and better high definition). Module does not use any coupling capacitors, so no worry about this.
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Old 15th October 2012, 07:18 PM   #7
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That is great thanks for the info I am going to seriously consider getting this amp.
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Old 24th March 2013, 11:05 AM   #8
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aquapiranha did you take the plunge in the end? I'd like to know more about this little gem and what it sounds like "in the field" so to speak and any comparison to mainstream amps.
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Old 24th March 2013, 11:40 AM   #9
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Default Teac AI-501DA using Abletec ALC-0180

The TEAC AI-501DA integrated power amplifier with 192kHz USB digital audio inputs and low power consumption is the powerhouse of TEAC's new 501 series. Hosting a BurrBrown PCM5102 D/A Converter, USB connectivity, Class-D ABLETEC Norway amplifier and a toroidal-core power transformer makes the AI-501DA a key component for the 501 series or any other 2-channel audio system.

This TEAC is using the Abletec ALC-0180 module.
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File Type: jpg teac2.jpg (77.8 KB, 218 views)
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Old 24th March 2013, 11:56 AM   #10
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After looking through the patent, it looks to me like its a dynamic hysteresis scheme going on, similar to that of ChocoHolic's SystemD.
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