SMD is our friend

teomannaskali · 23rd July 2007, 17:56

To get the size down you could use SMD resistors for the op amps.

Here you see a quad op amp package. 3 to amplify O2 sensors and one to amplify the depth sensor.

I like the op amp to be close to the sensors. What I can do with this is use the shell of a ballpoint pen stick all this in and then pot it. That makes a neat little package. All signals come in from one end. And all amplified signals come out the other end. you also have to enter +5V from that end.

Only the cables to one side have been soldered on the picture because once I solder the rest it would be verry difficult to take a picture.

Teoman

AD_ward9 · 23rd July 2007, 18:19

Agree on SMD, but if you want to get the size down, try 0201 sized resistors.

Sneeze and 10,000 take to the breeze like talcum powder.

Alex

23rd July 2007, 18:19	#2 (permalink)
AD_ward9 RBW Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jun 2005 Location: Scotland Posts: 2,011	Re: SMD is our friend Agree on SMD, but if you want to get the size down, try 0201 sized resistors. Sneeze and 10,000 take to the breeze like talcum powder. Alex
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