DIY Tesla Switch Guide

[Groundloop]

@All,

I have soldered my new replica of the Bedini/Brandt Tesla switch.
Next job will be mounting the board into a suitable enclosure.
I estimate to run the first tests next weekend.

Groundloop.

[Groundloop]

@geotron,

Attached is my version of the 4011 oscillator circuit.

Groundloop.

[DreamThinkBuild]

Hi Groundloop,

Professional circuit design as always. I just wanted to know the significance of keeping pins 8+9, 12+13 (on the NAND) actively low? Brings back memories of building gates with discrete components, everything now seems to be a single chip FPGA.

[mscoffman]

Hi Groundloop,

Professional circuit design as always. I just wanted to know the significance of keeping pins 8+9, 12+13 (on the NAND) actively low? Brings back memories of building gates with discrete components, everything now seems to be a single chip FPGA.

I can answer that.

That chip is a 4011 CMOS complimentary metal oxide semiconductor chip.
Spare inputs on cmos must be connected or they float to center of their
range and gate outputs can begin to switch due to the high gain of cmos
logic stages. Both hi/lo parts of a gate's output can come on simultaneously
ruining the cmos low power profile by using more power than the whole
rest of the circuit.

:S:MarkSCoffman

[Groundloop]

@DreamThinkBuild,

Eagle Cad always "nag" me of unused input pins. :-)
(High input impedance + static electricity = burned chip.)

Yes, the gated arrays chips is great but old school TTL is still in production.
A micro controller and some TTL's is still useful for small projects. :-)

Edit: @mscoffman is also correct. :-)

Groundloop.