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audio echo circuits
Been quite a few years ince I did a circuit for this...
But if I remember rightly panasonic had a family of BBD (bucket brigade delay) IC's which were quite good & small.
MN3000 series, low numbers I think. I think Panasonic stopped manufacturing them as times moved on but...
Throwaway. Please read my reply again.
I DID not say it could be done with an op-amp. I said if it was FOR an op amp you could use a negative earth.
ie. From the 12v supply available you could easily set-up an op-amp from a +6 / -6 supply using a virtual earth.
Since the original question...
Use a switch mode regulator to generate it, I seem to remember the MAX774 being a -5V generator. Depending on what you are planning on doing it may be advisable to follow the output with a 7905 linear regulator
If it simply an op-amp then simply a virtual ground!
>Do you know how to improve the PAE ?
It depends on what you need to do, There is a trade off between linearity and Efficiency!!
Generally speaking you will need a higher gain device, If you are not using an system where linearity is important for suppressing IMD. IE. FSK not ASK you can...
The efficiency of a PA is quoted as it's output power vs the DC power necessary to produce that output. IE. a 1 watt PA that draws 2 watts of DC power is 50% efficient.
... However using this figure a PA could require that you put 0.99999W in to produce the 1W output at 50% efficiency drawing...
Re: What is Transponder?
Rayengine, be carefull with RFID the tag is often refered to as the transponder. In this case the IC is normally a two terminal device where the terminals go out to a printed antenna with a cap & resistor to form a resonant circuit.
When RF is applied, by an...
Re: DB and DBm
dB must represent a ratio,
but dBm or dBW is an absolute for certain values.
It is still a ratio though.
the ratio is power/1mW (dBm) or power/1W (dBW)
that is a ratio...
... dBm = 10 log (Power/1mW)
ie. 10 dBm = 10mW
20 dBm = 100mW
30 dBm = 1000mW.
(1000-10mW) = 29.96...
erp times antenna gain
3rd Time lucky.....
Total Radiated Power is the power radiated per unit solid angle(radiation intensity), integrated over all solid angles.
ie. for a isotropic radiator (sphere) where power is radiated equally over all angles...
rad int = TRP/4.pi
Directive gain adds...
reference antenna for erp
Sorry read part of your question again...
ERP is an artificially constructed figure to measure how well a directive antenna concentrates energy in a specific direction.
Consider the difference in brightness between an identical value spotlight and a normal bulb, its...
erp vs eirp
Antenna gain is often quoted as EIRP, that is "Effective Isotropic Radiated Power", or the apparent power transmitted assuming that the antenna radiates equally in all directions, IE. the field is assumed to be spherical from a point source with an equal power transmitted in all...
We have PADS Powerlogic & PowerPCB for Windows at work,
I have used my Laptop which runs both Mandrake 9.1 and Suse 8.2
to run pads with Wine without a problem or really noticable speed issues.
About a year ago I needed these for work in (quite) large volumes.
Contacted Realtek and they couldn't help me get a europeon supplier,
I ended up getting them through Bizlink in the USA, I don't remember Bizlink being the best or the greatest supplier I've ever used - but they did send me...
OK.
I've done something similar to this in a previous life, couple of general points about it.
You will lose a lot of your transmit power through the skin & muscle, If you do a web search on S.A.R (Specific Absorbtion Rate, not the virus!) you should be able to get an idea of your...
Hi Niks,
My apologies for not replying sooner, work is a little crazy at the moment.
I am unsure as to what you are asking for now, original post said 400MHz, there are IC's around that will let you do 20kbps and above due to 433MHz being a popular ISM band, and 3.3V supply but would run off...
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