Re: Solid State Egg of Columbus Driver - Circuit Review Requested (fwd)

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Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sat, 28 Oct 2006 15:16:17 -0200
From: Antonio Carlos M. de Queiroz <acmdq@xxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Solid State Egg of Columbus Driver - Circuit Review Requested (fwd)

Tesla list wrote:

> From: Cameron B. Prince <cplists@xxxxxxxxxxxxxxxxx>

>>Here's the schematic:
>>
>>http://www.teslauniverse.com/circuits/egg_of_columbus_driver.pdf
> 
> 
> I built the driver portion of the circuit listed above on a breadboard last
> night. The inverter based square wave generator worked like a champ. I had a
> solid output at a steady frequency variable between 45Hz and 65Hz. The JK
> flip-flops failed miserably. They caused the output to have a sharp point on
> the bottom of the wave and the frequency jumped all over the place.

There is something wrong in this circuit. Where is the rectifier for
the low-voltage power supply? The PMOS transistors will be permanently
conducting, if not destroyed by excessive voltage between source and
gate.

Antonio Carlos M. de Queiroz