Which matches with graph in post #10 which shows 1mA at the top(but don't know what is Vgs for this curve).īut circuit shows positive supply to the gate, I don't know whether it is due to this reason the drain curve is showing 1mA instead of 0.4uA for Vgs=0 and maybe is also using positive gate bias.īecause when I use positive gate bias I also get the similar curve as shown below,īut a JFET(n-channel) on a drain curve has max current Idss when Vgs=0V and negative bias Vgs is only applicable. 1-3 Differential Amplifiers-Dual Monolithic N-Channel Junction FET. Many large manufacturers can produce 2N5457, such as ON, Central Semiconductor Corp, etc.Its Mounting Type is Through Hole,Operating Temperature range is -65☌. It is classified as Discrete Semiconductor Products, and typically, it is packaged in TO-226-3, TO-92-3 (TO-226AA). + Lambda=2.3m Vto=-2.572 Vtotc=-2.5m Is=181.3f Isr=1.747p 2N5457 is an age old JFET that was commonly used in Pre-Amp circuits. It uses about 1/2 ma, so a 9V battery will last a long time, you may also use simple regulated power supply with LM7809. It has low noise, low distortion, low feedback, overloads gracefully, is small, etc. MODEL J2N5457 NJF(Beta=0.150m Betatce=-500m Rd=1 Rs=1 This circuit is a discrete JFET pre-amplifier design, use 2N5457 as the main component. I used the same model posted by in post #10:
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