Data sheet acquired from Harris Semiconductor. SCHSC − Revised October HCDB consists of an oscillator section and December CDBMS. CMOS 14 Stage Ripple-Carry Binary Counter/ Divider and Oscillator. DATASHEET. Pinout. Functional Diagram. HEF Datasheet, HEF PDF, HEF Data sheet, HEF manual, HEF pdf, HEF, datenblatt, Electronics HEF, alldatasheet, free.

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However that would require one extra chip for datashfet one gate, whereas I had a spare flip-flop available which could be ab used for the same job.

When the hours counter is reset, so is the flip-flop, making its Q output high. My way of keeping this site alive.

SB-Projects – Projects – CMOS Clock – Hardware

Home Questions Tags Users Unanswered. Basically, the intrinsic capacitance of the breadboard may already be equivalent to the datasbeet crystal load caps. I can see with the ‘scope that I have a nice 11Mhz sinusoidal waveform on the pin 11, and I see a not-so-nice square-ish waveform on the pin 9 so, I imagine that oscillator parts works fine.

And now the hours counter. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Problem is that I have fixed values on the output pins!


Maybe this should be another question It uses a It doesn’t really matter whether we use a rising or falling edge here because this carry pulse is very short. From then on the flip-flop remains in that state, until the hours counter gef4060 reset to 0 again.

We’ll have to tell the clock what time it is when it has lost all its power anyway. These kind of capacitors usually have a black line on top of their body. Another link from an Illinois ECE college course states:. The precision of the resistor value has no effect on the precision of the time base B. One significant factor that most people neglect is the series parasitic inductance on the supply line.

Both inputs of IC10D are high when hef datasheet button is pressed, making its output low. This allows you to accurately synchronize the clock with a known good time source.

This page will describe sheet one in detail, while the next page will describe sheet number two. Now IC9D will inverse the pulses hef datasheet from the push button.

This pulse is very short because its cause is removed by the reset datashee instantly. The length of supply lines is almost always more than two inches from the power supply to the breadboard.


IC4B tries to do the same for the 0. However, it would make changing the crystal somewhat more involved. Moreover I don’t have the datasheet for the specific xtal, so I don’t know how to find right capacitor values.


You could even remove the oscillator and just toggle RS manually or use a function generator. Now IC9D will inverse the pulses coming from the push button. My way of keeping this site alive.

We need 1Hz, not 2Hz, catasheet feed to our seconds counter. TP1 is a test point at hef datasheet you hef datasheet measure the buffered hef datasheet While the clock is in run mode SET is high, opening the gate for the carry pulse.

oscillator – HEFB counter doesn’t count – Electrical Engineering Stack Exchange

I suggest fitting a 10nF to nF ceramic heef4060 next to the hole of pin 16 and pin 8 respectively. I tried with some random values, from 1 to pF, and nothing.

It must be a problem so silly that’s too evident for me to see!!