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Discrete OpAmp - Replaces Dual Channel DIP8 - design and PCB

Posted 11th May 2017 at 06:28 PM by googlyone

Well here I am travelling again, and this time stuck for an extra week away from home. The design bug has bit, and this time I tried keeping things small rather than crazy.

I have built a number of discrete operational amplifiers in the past. Usually integrating everything onto the board so that they wind up being preamplifiers rather than operational amplifiers.

If that confuses you - the difference is that an operational amplifier needs to be plugged into a circuit to be useful, a preamp is a standalone PCB.

The inspiration was seeing a burson amp on ebay. I looked and thought to myself "I keep starting that, and keep ending up with a preamp". Then I thought "Do it right for once".

The resultant goals:
- Dual channel op amp
- DIP8 pinout
- Good perfromance
- Class A (vs class AB which many are)
- Minimum size, whilst
- Sticking to 0805 SMD resistors caps, and...
Attached Thumbnails
Click image for larger version

Name:	Board1.jpg
Views:	89
Size:	424.7 KB
ID:	2386   Click image for larger version

Name:	Board 2.jpg
Views:	71
Size:	473.9 KB
ID:	2387  
Attached Files
File Type: pdf Composite CH1.pdf (11.6 KB, 71 views)
File Type: pdf Composite CH2.pdf (13.5 KB, 44 views)
File Type: pdf Schematic CH1.pdf (24.6 KB, 128 views)
File Type: pdf Schematic CH2.pdf (24.8 KB, 73 views)
File Type: pdf Final Artwork CH1.pdf (21.2 KB, 53 views)
File Type: pdf Final Artwork CH2.pdf (22.9 KB, 41 views)
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