#1620

Episode 1620 chip of the day
divide by 2 and divide by 8
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[@pavellishin2972]

I was having a hell of a time figuring out how the counter works, and this video helped me out tremendously - thank you!

[@californiakayaker]

That one has a cool display. Especially for its day. One for sale only at KZbin, $500 plus from Europe. Binging Chip of the day, very rainy stormy one at that ! I'd say your demoing the lagic dart, but, I'm old school, actually went to a college that featured TTL !

[@8-bitbitsa821]

I have some HP LogicDarts here, it’s great for old 8bit micros and microcontrollers. It does so much more than you first think, glitch detection etc. Much easier than hooking up big scopes and logic analyzers 😉

[@Homer19521]

Spock would love that LogicDart. An early version of the tricorder. Never saw one before.

[@jimomertz]

That LogicDart deserves a tear down! Can it probe itself? I wonder what microcontroller is in there.

[@IMSAIGuy]

not sure about the microcontroller but the display is from the HP48 calculator

[@jerryeiting5367]

Yeah I agree. I've not seen that before. Do more videos on it! I'd like to see what all it can do.

[@IMSAIGuy]

@@jerryeiting5367 search my channel for 'logic dart' there are several videos

[@pukkimi]

I opened an electronics supplier's packet just minutes ago and it incuded some divide by 256 counters for an oscilloscope project :)

[@jj74qformerlyjailbreak3]

I was looking at this DataSheet just 2 days ago.

[@E-Box]

That Logic Dart really stole the show!

[@Chris-ko4rd]

Everybody loves chop of the day. Can you identify what looks to be a breadboard 555 clock module in your circuit. That would really be useful. Thanks for your great videos.

[@IMSAIGuy]

search ebay there are many different designs

[@Mr_Meowingtons]

i legit just ordered 2 of them a few years ago making 2 Commadore 1581 FDD they take the 16Mhz and devid it down to 2Mhz

[@bobkozlarekwa2sqq59]

I have a one pulse per second source which is quite accurate. I’m wondering if there is a chip that will allow me to count 60 pulses and then give me one pulse out every one minute?

[@stephentrier5569]

Sure! This was done many times for digital clocks back in the day. The 74LS57 was a divide-by-60 chip, now discontinued and hard to find. A more common solution was to combine a 74x90 with a 74x92. The '90 has ÷2 and ÷5 counters and the '92 has ÷2 and ÷6, so you can cascade three of those sections to get ÷60. It's also possible to make counters of arbitrary lengths various ways with flip-flops and logic gates.

[@gilbertojunqueira314]

4026 or 2x 4017(cascading)

[@jagmarc]

a 50 cent microcontroller with about 10 instructions. 8 pin DIL . Could code & program one faster than wire up discrete TTL chips

[@iblesbosuok]

Can be fulfilled with a CMOS 4024B or 4040B binary counter, four 1N4148 (or eq) diodes & a 10k-22k resistor. The diodes & resistor are arranged to form an AND gate which resets the counter every time it reaches 111100. The duty cycle of the pulse would be 28 over 32.

[@jagmarc]

With a PIC10F222 & work for nany other pics. [EDIT tested on real 10f222 & works] (1 component only = 8 pin IC ) MOVLW B '00001101' TRIS GPIO MAIN_LOOP MOVLW .60 MOVWF 0x10 // variable WAIT_POS_EDGE BTFSS GPIO, 0 //input pin 5 GOTO WAIT_POS_EDGE TIME_NEG_EDGE DECFSZ 0X11, F GOTO TIME_NEG_EDGE DECFSZ 0X10, F GOTO WAIT_POS_EDGE BSF GPIO, 1 // output pin 4 TIME_OUTP DECFSZ 0X11, F GOTO TIME_OUTP BCF GPIO, 1 GOTO MAIN_LOOP

[@TonyBarr99]

Why is this chip called a "counter?"

[@stephentrier5569]

Its binary output increments by 1 for each cycle of the clock input. It counts clock cycles, hence "counter".

[@Mr_Meowingtons]

i legit just ordered 2 of them a few years ago making 2 Commadore 1581 FDD they take the 16Mhz and devid it down to 2Mhz

[@TonyBarr99]

Thank you!@@stephentrier5569