| ??? 11/09/05 14:55 Read: times |
#103483 - 8 channel 35 mhz counter Responding to: ???'s previous message |
Hello Anil, Jan and all,
Jan the 8 channel 35 MHz counter has progressed. The latest schematic can be seen at http://members.aol.com/cpu8052/4051fc.gif. I have made a printed circuit board which I will post later. The frequency counter can be used multiple ways. Without a seven segment led counter it can be hooked up to a comm port of an IBM type computer with a communication program and it will show the frequency on the 8 channels. With a seven segment led counter it shows the frequency. Four more bells and whistles have been added. 1. A push button can be depressed to stop the scanning of the 8 channels and just show one channel continuously. 2. You can select the channel from the host IBM PC thru comm port (i.e. type ch = 4 on keyboard on IBM PC would select channel 4) 3. A software real time clock settable from the IBM PC keyboard has been added. The frequency and clock is displayed thru the comm port. 4. Eight LED's driven with a 74LS138 has been added to show which channel is currently being scanned. Regards, Charles Bannister |
| Topic | Author | Date |
| fast counter | 01/01/70 00:00 | |
| using external prescaler | 01/01/70 00:00 | |
| try f120 @ 100MHz | 01/01/70 00:00 | |
| 8 channel 35 mhz counter | 01/01/70 00:00 | |
| Charles: Check C1 | 01/01/70 00:00 | |
| Schematic corrected. C1 corrected. | 01/01/70 00:00 | |
| what is different | 01/01/70 00:00 | |
| Scaling | 01/01/70 00:00 | |
| works, thanx | 01/01/70 00:00 | |
| Any reason for opposite ... | 01/01/70 00:00 | |
| does it matter? | 01/01/70 00:00 | |
| No, of course | 01/01/70 00:00 | |
Any reason opposite? Worked out that way | 01/01/70 00:00 |