Ludicrous 555

RE: Ludicrous 555

dougw — Thu, 20 Oct 2022 18:24:50 GMT

Was the temperature due more to frequency or just high voltage? The 5k-5k-5k resistors alone would only dissipate .04 W @ 24 V.

RE: Ludicrous 555

colporteur — Wed, 12 Oct 2022 01:11:55 GMT

Bugler, play taps for the valiant CMOS 555.

RE: Ludicrous 555

DAB — Tue, 11 Oct 2022 19:28:44 GMT

The old 555 continues to amaze me even after all these years.

RE: Ludicrous 555

kmikemoo — Tue, 11 Oct 2022 16:55:30 GMT

Fantastic experiment! Loved it.

RE: Ludicrous 555

scottiebabe — Mon, 10 Oct 2022 18:56:19 GMT

Not a fair race, but with a 74 Advanced CMOS Schmidt trigger (74AHC1G14) I got 156 MHz using only a 1 kOhm feedback resistor in a relaxation oscillator configuration.

No capacitor was added only the effective input capacitance of the inverter.

Regardless, I loved your blog and experiments! You really squeezed every last Hz out of your 555 oscillator.

RE: Ludicrous 555

jcverive — Mon, 10 Oct 2022 17:51:09 GMT

Failure in CMOS devices subjected to voltages above the "Absolute Maximum" ratings can occur due to many different mechanisms - many of which cannot be staved off significantly by heatsinking.

Nonetheless, kudos for experimenting and for reporting your results!