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CA-0251 Discrete Opamp
CA-0251 Discrete Opamp
US$40.00
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BB2521 IC-DOA PCB
[BB2521-PCB]
Quantity: 1+10+ 25+ 50+ 
Price for each:US$2.75US$2.65US$2.50US$2.22
Your savings:- 4%9%19%
Number of Products in stock: 442

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Click to enlarge

The BB2521 is hybrid opamp utilizing a single DIP8 IC opamp with a pair of larger power transistors as an output stage. With this discrete output stage, the BB2521 can be used in every location that a standard 2520 can be used in. For example, the BB2521 can directly drive an output transformer (as found in a 312 preamp circuit) with excellent results. The footprint is identical to that of a 2520 to make plug-n-play in all of your favorite gear a breeze.

The original concept of the hybrid opamp is far from a new one. This circuit is heavily based on the output stage of the old B&B EQF-2 equalizer. B&B was eventually bought by Aphex somewhere around 1980. Just about every major pro audio manufacturer using chips and output transformers has used some variation of this concept including Aphex, ADM, Neve, Harrison, UREI and more.

The goal for this kit is low cost and ease of build while still being a very good sounding and useful operational amplifier. The BB2521 is all of that.

I have multiple kits available with a few different IC's included. The 5534 version is a very good sounding opamp while the LME49710 version is considered sonically superior, amongst our audio friends. Feel free to experiment with other chips. Any IC that is pin compatible with a 5534 should function just fine in the BB2521. Keep in mind that a 5534 requires a 22pF cap between pins 5 & 8. These pins have no connection on the LME49710 so the cap can be left in without causing any harm.

Some of the applications the BB2521 opamp can be used for:
Microphone Preamplifiers
Line or Booster Amplifiers
Lossless Combining Amplifiers
Balanced Transformerless Amplifiers
Equalizers and Compressors

Additional features and specs:
Industry standard 2520 footprint for plug-in or PC mount connections
Low noise, high power output
Low distortion
Power supply voltage is bi-polar, consult IC's datasheet to determine operating voltage
A complete PDF assembly guide including BOM will be provided via email after purchase

***Please note: This item is a raw, unpopulated PCB only. All other components in pictures are for informational purposes only.

Additional information and photos:

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This product was added to our catalog on Tuesday January 01, 2013.
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Classic Audio Products, Inc. is not affiliated with API. Customers and fans should not refer to Classic Audio Products, Inc. as "Classic API." API is a registered trademark of Automated Processes Incorporated. Classic Audio Products, Inc. has no affiliation with Automated Processes Incorporated.
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