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You can also make a variable-frequency oscillator VFO or get one as a dataaheet of workbench equipment. Hello, Did you see my last remark in my previous post? Not intentionally hijacking this thread but Select a forum You can look this. Oct 12, 3.
org • View topic – Getting Crystals Made
I tried using a inverter see attachment for configurationand 74ss124 removing the capacitor and lowering the value of R to the point just before oscillation stopped, I measured a frequency of 5 MHz with my oscilloscope. I came across one of those in the topics I was looking up to link above. I made a jouletheif circuit, only with 2 coils.
Sat May 01, You May Also Like: When 74z124 power supply is 12 Volts, the speed will be much higher as when 5 Volts is used. Dividers are obviously lacking resolution anywhere near the input clock speed Definitely do the inputs, but with CMOS logic the outputs should be driven hard enough to be a non-issue, and I’d rather not deal with the possibility of accidentally activating the device’s clamp diodes.
Substitute with or or 74LSxx. Apr 14, 7, No, create an account now. Parasitic capacitance is not normally an issue. The reason for connecting the unused sections of the hex Schmitt inverter to the power and ground planes as shown above is to effectively reduce the power-lead inductance for better behavior at high speeds, since 74xx DIPs’ pinouts were set to be at the corners decades ago before designers could foresee rise times reaching such speeds that the lead inductance would be a problem.
Dec 10, 50 3. A few other places we discussed clock oscillators: Sun May 02, 2: Based on the national time clock signal. I remember reading about it in these forums awhile back how someone used an AVR for an excellent programmable clock source. Mitsubishi’s Floating Aerial Displays Mitsubishi plans to commercially release a system that can display floating images by And reduced down to 2. 74s214
>5Mhz oscillator with discrete logic chips
Oct 2, 17, 5, Inconsistent Results with Different Chips Posted by jpanhalt in forum: What is the fastest speed recommended for both? However it also works well with small prototyping PCBs turned upside down copper at the top.
Apr 28, 3, Oct 24, 4. A couple of the topics here where we discussed oscillators are here and here.
Since there is no typical cct mentioned in the 74S datasheet, I implemented the following circuit diagram and observed the output. No registered users and 0 guests. Previous topic Next topic. Sun May 02, 1: Datasheett 17, 7. Help with IC Equivalents Posted by awinstephen in forum: The idea for using the VFO is to increase the frequency until the computer starts having problems, measure the frequency, back down a little bit, and then buy a standard crystal oscillator can for the 774s124, whether that turns out to be 16MHz, 14MHz, or whatever.
Help with 74S IC | All About Circuits
What is the wrong with cct? You could add a microcontroller for the purpose, I suppose. Nov 17, 2.
How do they work? I heard that it wasn’t too expensive to get crystals made so I thought about getting them made for the 65C02 and WDC 65CS and for other processors.
Nov 17, 8. Yes, my password is: You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum. Modify R1 and C1 for desired frequency.
I used to look at a CD datasheet, I still remember the part without looking it up! Still need help with l ic circuit. Nov 17, Quote of the day. I don’t remember if it was Atmel.
This is quite interesting. The clamp diodes will only conduct if you take a pin outside the power supply range; and actually that will happen less if you reduce the ground daatasheet by providing these extra power and ground connections.