Dr.EM
New Member
I have often made this circuit with 2N3906 as they were convenient:
http://www.mp3forkidz.com/mic/phantxy.html
But they arn't the quietest transistors. I tried to find an equivalent to the NTE159 ones specified on the diagram. I used this site:
http://www.cedmagic.com/tech-info/rca-diode-transistor.html (near the bottom, the NTE number is a link/in blue)
The cross reference was found as PN2907. Thats good, my electronics supplier stocks them, but on the datasheet I cannot find a noise figure (the critical aspect here). Can it be assumed to be the same as the NTE159 (is it indeed the same part)?
Another (I think) suitable one I've found is the BC560. This appears to be a low noise model with high enough voltage rating for the circuit. It isn't as readily available to me though (only at Maplin, limited stock locally).
http://www.mp3forkidz.com/mic/phantxy.html
But they arn't the quietest transistors. I tried to find an equivalent to the NTE159 ones specified on the diagram. I used this site:
http://www.cedmagic.com/tech-info/rca-diode-transistor.html (near the bottom, the NTE number is a link/in blue)
The cross reference was found as PN2907. Thats good, my electronics supplier stocks them, but on the datasheet I cannot find a noise figure (the critical aspect here). Can it be assumed to be the same as the NTE159 (is it indeed the same part)?
Another (I think) suitable one I've found is the BC560. This appears to be a low noise model with high enough voltage rating for the circuit. It isn't as readily available to me though (only at Maplin, limited stock locally).