kowski

Thanks for the welcome, Pete!

I came across this thread a week or two ago and I'm going to start putting my own little driver and circuit together starting today or tomorrow. The only thing I need to get before I can start is a piece of steel for the blade. The guys and gals at the local hardware store couldn't seem to figure out where they keep their steel stock...

I've studied the schematic and, from the looks of it, Here's what I need:

Caps: 100u, 220u, 22u, 100n, 22n

Make sure that the 22uF, 100uF, and 220uF caps you get are electrolytic.

The schematic indicates 3 different choices (2N5457, J201, MPF102). Any preference?

The Q1 component has 3 poles, ground, source and drain. Which one is which on the schematic?

I picked up a 2N5457 transistor to use for my circuit, so we'll see how that turns out. Here is how the pins correspond:

Also, here is some info from the LM386 datasheet about the gain:

GAIN CONTROL

To make the LM386 a more versatile amplifier, two pins (1

and 8) are provided for gain control. With pins 1 and 8 open

the 1.35 kW resistor sets the gain at 20 (26 dB). If a capacitor

is put from pin 1 to 8, bypassing the 1.35 kW resistor, the

gain will go up to 200 (46 dB). If a resistor is placed in series

with the capacitor, the gain can be set to any value from 20

to 200. Gain control can also be done by capacitively coupling

a resistor (or FET) from pin 1 to ground.