A
Anonymous
Guest
I have just found a couple of data sheets on the 709 amongst the dust and cobwebs in the attic. One is by Fairchild and the other, Raytheon. The only ones I can get now are National Semiconductor and these are becoming difficult to obtain. According to the Fairchild data, the gain falls to 0db at about 10MHz, which is more reasonable than the higher figure I quoted earlier. I use a gain of 45db with the 10p and 3.3p compensation capacitors (no R). This gives a flat response from dc to 2MHz which is adequate for the sampling delays encountered in TH detectors. Most times I now use the NE5534 which doesn't require external compensation, but is a bit slower for the same gain.
Eric.
Eric.