It can be done for 6 cheap signal source of square wave oscillators, just adding 6 RC and some 6 pots.If the oscillator needs to drive only a very light load (a few mA) you could make one simply from a CMOS Schmitt gate such as a CD40106.
What?It can be done for 6 cheap signal source of square wave oscillators, just adding 6 RC and some 6 pots.
The crystal oscillators and inverter oscillators.What?
Ken
Apparently (allegedly) the CMOS 555 can do 2MHz, I was told the limit for a bipolar 555 was 100kHz but I'm sure I've had more than that from one - 350kHz isn't that far out if you're not too fussy about squarewaves actually being square."Could the frequency have been the cause?" The 555 won't operate properly above about 350KHz. You are trying to run it at 1000KHz. Yes, that is the logical conclusion?
Ken
The datasheet mentioned that the mic1555 can be oscillate reach to 5Mhz when it using RT = 1k, CT = 47pF, Vs = 8V, but I don't have this chip in hand, and it's quite expensive around US$1.23/ 1pcs in Taiwan online store.Apparently (allegedly) the CMOS 555 can do 2MHz, I was told the limit for a bipolar 555 was 100kHz but I'm sure I've had more than that from one - 350kHz isn't that far out if you're not too fussy about squarewaves actually being square.
Past experience has made me wary of some datasheet claims.The datasheet mentioned that the mic1555 can be oscillate reach to 5Mhz when it using RT = 1k, CT = 47pF, Vs = 8V, but I don't have this chip in hand, and it's quite expensive around US$1.23/ 1pcs in Taiwan online store.
Using a 40Mhz crystal oscillator module, and get some counter IC as 74HC390, 74HC393, 74HC4040, and some dip switches, some divided by 2, some divided by 5, some divided by 10 then you can get a precisely oscillator.Past experience has made me wary of some datasheet claims.
Years ago I bought a kit to build a Colour TV pattern generator, both timebases came from 555s - the 50Hz vertical timebase was no problem, but the 15.625 kHz horizontal generator was all over the place.
The 555 is certainly capable of more than the PAL horizontal frequency, but its getting into the realms of stray reactances around the PCB getting significant compared to the specified values.
After about a week of experimenting with ways to make the timebase stable, I just gave up and built a TTL timebase generator dividing down from 10MHz.