Sycophant booster

[soggybag]

Here's my amazing an "original" take on the SHO/MosFET Boost. Now with crackle free knob. I'll take your silence to mean that I haven't made any obvious blunders.

This seemed to work pretty well on the breadboard. Swap C3 for a smaller value to create a range booster.

[PRR]

> I'll take your silence to mean that I haven't made any obvious blunders.

Pretty quiet on this thread.

I see no blunder. Adjustable gain amplifier. As you say, big C3 boosts everything, small C3 just boosts highs, salt to taste. Useful tool.

The nervous side of me wants 10K-68K in series with the Gate. Not needed in normal operation. But on a very dry day, if you rub the cat with your silk blouse, then touch the cable tip, the static discharge "could" blow the Gate and kill the MOSFET. Back in 1973, a naked MOS gate was begging for blow-out and often found it. Modern devices seem to be much better protected. Maybe they will survive all normal abuse. Probably not worth retrofitting. But if you ever get mystery failures on an input MOS device, specially on dry days, try some gate resistance.

[oliphaunt]

Looks good, I'll check this out.  I'm always on the hunt for the right boost, it's an amazingly tricky thing to find!

[soggybag]

> I'll take your silence to mean that I haven't made any obvious blunders.

Pretty quiet on this thread.

I see no blunder. Adjustable gain amplifier. As you say, big C3 boosts everything, small C3 just boosts highs, salt to taste. Useful tool.

The nervous side of me wants 10K-68K in series with the Gate. Not needed in normal operation. But on a very dry day, if you rub the cat with your silk blouse, then touch the cable tip, the static discharge "could" blow the Gate and kill the MOSFET. Back in 1973, a naked MOS gate was begging for blow-out and often found it. Modern devices seem to be much better protected. Maybe they will survive all normal abuse. Probably not worth retrofitting. But if you ever get mystery failures on an input MOS device, specially on dry days, try some gate resistance.

Thanks for the analysis. Sounds like you're suggesting putting a 10K to 68K resistor between the Gate and the C1 R1 R2 junction? I put D1 in there based what everyone else seemed to be doing. I'm not really sure what's right here. I just jumped off the bridge because everyone else did. I haven't had any trouble yet. But, then again I don't own a cat, or a silk blouse for that matter. Though I do own a cashmere sweater and some lyrca cycling shorts...

[Renegadrian]

Seems a nice variation, easy enough to try...
btw, C1 is .1 so 100nF, C3 is 100(nF)? So they are the same value right?