Search found 80 matches

by mikeb
Wed Feb 12, 2003 5:36 pm
Forum: General Discussion
Topic: POST FOR CHRIS FOLEY
Replies: 1
Views: 792

POST FOR CHRIS FOLEY

HELLO CHRIS I MUST HAVE WRITTEN THAT WRONG PIN 2 CLOCK INHIBIT IS TIED TO THE GROUND BUS.PIN 1 TO CARRY OUT OF IC 1, PIN 3 DISPLAY ENABLE IN TIED HIGH. IM WONDERING IS THER SOME TYPE OF CONNECTION THAT NEEDS TO BE MADE FROM THE DISPALY ENABLE OUT PIN OF IC 1 TO THE SECOND IC. IF U HAVE A SCHEMATIC O...
by mikeb
Wed Feb 05, 2003 4:32 pm
Forum: General Discussion
Topic: cd4026 help
Replies: 1
Views: 844

cd4026 help

is there any one with knowledge as to how wouldi interface 2 or more cd4026be counter ic's to create a multi digit display. the chip has a clock input pin which i have connected to a 1 hz source, a clock inhibit (active high pin which i have connected to ground. it also has a display enable in pin w...
by mikeb
Wed Feb 05, 2003 4:14 pm
Forum: General Discussion
Topic: How to tell the value of an inductor?
Replies: 20
Views: 5226

Re: How to tell the value of an inductor?

i need your email address that can handle a file that almost 3 megabytes wide. hotmail cant accept files that big . the schematic was done in mspaint so its quite big.
by mikeb
Sat Feb 01, 2003 6:47 pm
Forum: General Discussion
Topic: 555 timer help
Replies: 1
Views: 812

555 timer help

im using a 555 timer in a circuit that i need to clock a 74hc161 counter, i have 1 counter on the clk input of the counter and 1 on the chip enable pin. the timer on the ce pin is set for monostable operation.the problem is not that the circuit doesnt work it actually works just fine . the porblem i...
by mikeb
Sat Feb 01, 2003 6:21 pm
Forum: General Discussion
Topic: Digital Lock Schematics
Replies: 5
Views: 1509

Re: Digital Lock Schematics

kim i have a schematic for a digital lock im using on my home security system, its very basic and very simple to hookup it uses 2 mc14013bp quad flip flops, if u want to add another set of flip flops the lock can then be locked with a 4 digit code and unlocked with a 4 digit code both codes are ente...
by mikeb
Sat Feb 01, 2003 6:03 pm
Forum: General Discussion
Topic: How to tell the value of an inductor?
Replies: 20
Views: 5226

Re: How to tell the value of an inductor?

i have the schematic for a simple inductance meter that u can make A very inexpensively inductance adapter for your dvm give me a email an ill send it to.
by mikeb
Mon Jan 27, 2003 1:47 pm
Forum: General Discussion
Topic: microcontroller question?
Replies: 1
Views: 791

microcontroller question?

is it possible to short say port pin of a mcu like say portd with out affecting the total operation of a mcu. i have 2 microcontroller chips that still run the program thats in internal eeprom but the chip wont allow me to accees the terminal program to revise this program. all of the other subsyste...
by mikeb
Fri Jan 10, 2003 4:54 pm
Forum: General Discussion
Topic: PLCC 52 PIN SOCKET
Replies: 2
Views: 1008

PLCC 52 PIN SOCKET

IS THERE ANYONE WITH INFORMATION ABOUT WHERE I CAN FIND THE COMPLETE PINOUT FOR A 52 PIN PLCC SOCKET LOOKING FROM THE SOLDER SIDE I CAN LOCATE PIN 1 BUT I NEED TO KNOW WHERE IS PIN 2 AND 3 FROM PIN 1.
by mikeb
Sat Dec 14, 2002 10:47 am
Forum: General Discussion
Topic: sci to com port 2
Replies: 0
Views: 835

sci to com port 2

im trying to interface a micro controller's sci interface to my computer, the manual for the micro controller says to set the com port for 4800 baud , 8 bit data, 1 stop bit and ful duplex, my computers com port has all theses settings except the one for full duplex, it does however have a setting f...
by mikeb
Tue Dec 03, 2002 6:28 pm
Forum: General Discussion
Topic: LEXPRO RE:- - -ANALOG TO DIGITAL
Replies: 4
Views: 1308

Re: LEXPRO RE:- - -ANALOG TO DIGITAL

i was able to find a schematic of the digital dial in question. the circuit was listed in a 1985 article of radio electronics. it uses a ds8629 prescalerand a mm5430 counter ic. now my problem is finding the chips to make this circuit. i was able to located the mm5430 fairly easy, but the ds8629 has...
by mikeb
Tue Dec 03, 2002 2:14 pm
Forum: General Discussion
Topic: LEXPRO RE:- - -ANALOG TO DIGITAL
Replies: 4
Views: 1308

LEXPRO RE:- - -ANALOG TO DIGITAL

YES THAT WHAT IM TRYING TO DO EXACTLY. TO SDISPLAY THE FRQUENCY DIGITALLY, I HAD A SCHEMATIC THAT DID THIS EXACT THING FROM WHAT I REMEMBER THE CIRCUIT USED SOME TYPE OF PRESCALER AND ANOTHER IC, THAT INTERFACED WITH THE 7 SEGMENT DISPLAYS TO SHOW THE FREQUENCY IN DIGITALLY. I HAVE MISSED PLACE THE ...
by mikeb
Mon Dec 02, 2002 10:08 am
Forum: General Discussion
Topic: Analog to digital
Replies: 2
Views: 963

Analog to digital

What Im needing is a circuit that will convert and old analog tuning dial, to a digital readout dial for a fm reciever. Im aware that this circuit must be connected somewhere between the if mixer and the first if amp stage. but I would like to know is there any info on this subject, as far as a sche...
by mikeb
Mon Dec 02, 2002 10:02 am
Forum: General Discussion
Topic: need info about the mm5369
Replies: 0
Views: 834

need info about the mm5369

Is there any one that can tell me where I can find a mm5369 60 hz timebase chip, it seems to be obsolete and very hard to find,if this chip is unavailable is ther a direct replacement for it.
by mikeb
Sat Nov 30, 2002 10:59 am
Forum: General Discussion
Topic: SCI to the PC
Replies: 0
Views: 837

SCI to the PC

my problem is trying to get the 68hc11 to communicate with a temperature software program on my pc. the program uses com2 at 4800 baud, 1 stop bit , 8 data bits, and no parity and is bundled with the mcu and eeprom. i was able to set these requirement on my pc for com 2. im also able to get the mcu ...
by mikeb
Wed Nov 27, 2002 10:04 pm
Forum: General Discussion
Topic: Video Amp
Replies: 2
Views: 1000

Re: Video Amp

YOU CAN GET A SCHEMATIC FOR A VIDEO AMP FROM DESIGN NOTES.COM, UNDER DISCOVER CIRCUITS.