Does anyone know if a 12F683 running on 3.3 volts in the SoftRock 8.3 circuit will operate reliably if, instead of using a DIP switch to ground pins on the...
It appears from that table (which I had missed before) that if Vdd is 3.3 volts, then the maximum for a logic low is .15 * 3.3v, and .7 volts will be too high....
Yes, that is how the data sheet is to be read. As far as using diode steering or diode logic, a couple points. First is that 0.7 volt drop is the common...
I should also add that any inexpensive NPN transistor can be used as a switch with a Vsat around a couple tenths of a volt. Hence it is possible to use the...
Hi Cesco, I received your $30 US payment for a XTALLv1.1 kit with a CMOS Si570 device. I am currently waition on an additional order of 100 CMOS Si570 devices...
Hello all, Can someone help me find the softrock SDR card that was designed to be a 455KHz IF?? Would appreciate any help. I understand this kit is soldout...
I would like to know how many would be interested in a parts kit for my HSUSB board. The parts are all available from DigiKey. But, apparently, DigiKey...
... ground ... at .7 ... sheet of ... Hi Pete, To use a single pole rotary switch, add a TTL 8-to-3 encoder (74xx148) and pull any one input to ground at a...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the softrock40 group. File :...
softrock40@yahoogroup...
Jul 1, 2008 11:03 pm
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VERY nice piece of work, Dick. This makes the most difficult part easy. Nothing happened when I first pressed the botton. It took me a minute or two to read...
Another of Dave's boards, DDS using the AD9912 chip. I have several DDS units, this one beats them all. Very easy to assemble and can be used with the SR's...
I have decided to go ahead and do a kit of parts for the HPUSB board. There will be a full kit including the Cypress chip and a partial kit including...
Dick, After using all the other calculators this is MAGIC! It will make reprogramming the PIC a simple job taking few minutes once one has done it a few times!...
I am in UK, I have placed an order for the PCB but Cypress have declined my request for a sample processor and I can't find another source. A kit of parts...
Good question - I am rethinking that, given that I have a separate switch wafer dedicated to frequency control, and another for switching the BPFs. Maybe I...
Unfortunately, I need 4 outputs, because the codes for several bands use the 4th digit. Actually, I think I have a super-simple solution - I'll test it and...
I have released the IQTRX source with GPL2 licence. http://iqtrx.googlecode.com/svn/trunk/ This is not intended as a replacement for Powersdr or KGK-sdr. Since...
Hi all, This link was in another reflector. It's http://www.amateurlogic.com/ but I felt it was worth posting here. This site is dedicated to video news...
Hello Bob, Very interesting, just goes to show you we can all learn new techniques. Thanks for posting. 73 Jack, W3TMZ ... From: Bob Bruno - K2KI To:...
Hi all, All Si570 orders have been shipped (or will be in the next couple of hours). I have 4 CMOS left that can be shipped quickly. New orders will "collect"...
What are the differences between the FlexRadio version and the ones modified for SR RXTX? I am trying to understand how the FlexRadio and RXTX differ other...
... I don't know if the 12F683 has internal pull-ups. If so, then a single wafer switching between ground and open will suffice. Generally with CMOS, an open...
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