Re: LF: Si5351A syntehsiser able to fire a FET driver chip directly??

[Andy Talbot <andy.g4jnt@gmail.com>]

When I said bias half way, meant half way between the two logic threshold limits.  Ie mid way between 1.3V (upper limit of guaranteed '0' and 2.4V (lower limit of guaranteed '1')  so bias at 1.8V

Not half the supply volts.

Study the data sheets and calculate.  Don't just play with components willy-nilly.

Andy  G4JNT

On 1 January 2018 at 22:02, Chris Wilson <dead.fets@gmail.com> wrote:

Hello Markus,

I am now using an MCP1404 so I can delete the 5V regulator

http://www.gatesgarth.com/MCP1404.pdf

So am I ok using another pair of 15K to pins 2 and 4 up to pins 6 (12V
DC  +)?  Thanks,  this  is  all  rather academic, given the latest U3S
firmware  allows  direct output of two signals from the Si synthesizer
180 degrees out of phase I just fancied seeing if I could reduce the
component   count of an amp.  (Just fancied fiddling....probably not a
good idea, but I need to learn ;))  Thanks Markus, happy
New Year to you!

Monday, January 1, 2018, 9:38:56 PM, you wrote:

>> Any ideas please?

> As Andy said, bias half way: place another pair of 15k from the inputs (Pins 12,10) to 5V (pin9).

> 73, Markus

--
Best regards,
 Chris                            mailto:dead.fets@gmail.com