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DO NOT short this device out with copper strips. The bias connnections are more likely to still be in place and you will damage the PSU. The capacitor shorting is by far the best method. Use a 47Pf cap to start with. The device cannot oscillae because it will be missing. you may have...
By the way if anyone would like this program let me know and i will upload it.
Giovani B** something was the guys name who developed the program. It only works on windows 95..
Bagster
Edge Coupled filters
Has anyone ever seen a filter program called GBCL, i downloaded it a few years ago. It calculates the Width, length and gaps for edge filters. This software is based on a book by matai, jones and young.
Now, you can manually work through the book to get the same results...
Ultra cheap design. Use a full wave rectifier to get dc and then a large resistor. If the current from your circuit is characterised you can select the resistor to give you the desired voltage. Be aware of transients! These can and will destroy a PIC.
A linear regulator off this supply could...
convert lumped elements to transmission line
Are you trying to replace a physical inductor with a meadnered hi impedance line?
This can be done, equations to calculate this will be highly dependant on the substrate material and obviously the frequency. This is generally done for cost cutting...
samplingphasedetector
Thanks, i get it now. Can you talk me through the analogue circuitry......
IE the offset and the low pass filter.
Firstly, you filter the signal to remove the beat, then you do you add an offset to get the loop (when in lock) voltage to vcc/2, is this correct. OR do you...
op amp phase detector
Hi
Thanks for the reply.
Do you have any schematics for a typical baseband opamp/filter setup. I can understand how the beat is done, and the offset but how does the loop distinguish between a frequency that is higher or lower than the actual lock frequency.
I would be...
sampling phase detector
Has anyone out there done any SPD designs. I can do the RF work no problem. Does anyone have any schematics for the opamp/baseband locking of the oscillator. I really need schematics or a good paper or description of how to configure the opamps.
Thanks in Advance...
Does anyone have any good links or appnotes to fully explain opamp parameters, mainly noise, but all others, offset, cmmr etc
I really need to know what to specify for a high performance opamp.
Thanks in advance
Bagster :roll:
Maxim/Dallas do a logger that is exactly what you need. No interfacng from a micro. All youu need is a DS1615 chip (or similar in the raange) and a rs232 to ttl convertor. Do a simple program in visual basic and you can get temperature data. There is also a rtc on board, battery info. I...
noise negative voltage
i know quite a few.
for single stage, you can either do this using a custom IC or using discrete components. i am assuming you want to bias at a fixed voltage and with a constant current. what is the gate current, how much do you need. What FET are you using.
If it is...
433 receiver circuit
you can build a simple AM transmitter using one bjt (infineon BFP 420 or similar). You need a ceramic resonator (433.92 Mhz) and a couple of capacitors. The oscillator design is based on a negative resistance colpitts topology.
I do have a layout if you are interested...
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