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Correction re:Re: [TekScopes] 1L10 crystal needed (Newbie)


Brad Thompson
 

Harvey White wrote on 1/24/2021 8:00 PM:

Use a 74LS90, which is a divide by 2, and a separate divide by 10. <snip>
Hello--

IIRC, the 74LS90 has  divide-by-2 and  divide-by 5 sections. If you need a divide-by-10 square wave,
feed the divide-by-5's output to the divide-by-2's input.

73--

Brad  AA1IP


Harvey White
 

Yep, covered that in less words..... <grin>


Harvey

On 1/24/2021 8:10 PM, Brad Thompson wrote:
Harvey White wrote on 1/24/2021 8:00 PM:

Use a 74LS90, which is a divide by 2, and a separate divide by 10. <snip>
Hello--

IIRC, the 74LS90 has  divide-by-2 and  divide-by 5 sections. If you need a divide-by-10 square wave,
feed the divide-by-5's output to the divide-by-2's input.

73--

Brad  AA1IP






Harvey White
 

Or was that more words?

You can get one, but mouser doesn't have any, for less than two dollars.  You could likely spend a bit of time doing the divide by 10, or just find one with a 900 Khz output and stuff a resistor/capacitor low pass filter across the output.  No idea, though, on what the original circuit wants.

Harvey

On 1/24/2021 8:16 PM, Harvey White wrote:
Yep, covered that in less words..... <grin>


Harvey

On 1/24/2021 8:10 PM, Brad Thompson wrote:
Harvey White wrote on 1/24/2021 8:00 PM:

Use a 74LS90, which is a divide by 2, and a separate divide by 10. <snip>
Hello--

IIRC, the 74LS90 has  divide-by-2 and  divide-by 5 sections. If you need a divide-by-10 square wave,
feed the divide-by-5's output to the divide-by-2's input.

73--

Brad  AA1IP