26 Threads found on edaboard.com: Schematic Transistor Receiver
i'm looking for a schematic diagram for a syperheterodyne Rx with a proper values for the parts,coz i need to simulate it,can anyone help??
RF, Microwave, Antennas and Optics :: 10.04.2005 12:27 :: maramiro :: Replies: 1 :: Views: 415
I need UHF mixer schematic for downconverting ~450MHz to ~45MHz.
This is a receiver project.
Ther are a lot of docs. on the web about mixers. But I can't use any special IC . I have to use only a few transistor for "mixer" section.
RF, Microwave, Antennas and Optics :: 24.02.2004 04:11 :: cozturk :: Replies: 1 :: Views: 1149
I need schematic for design of loop powered 4-20mA transmitter(output section )
I need solutions with opamp,REF,Reg,transistor(discrete )
Analog Circuit Design :: 17.06.2009 11:20 :: 7rots51 :: Replies: 1 :: Views: 2271
help me... having same problem....i am using gl40 2r/2t set...circuit is working properly but the receiver does not receive the transmitted signal........the schematic can be viewed below58583
Hobby Circuits and Small Projects Problems :: 10.07.2011 14:54 :: Fugitive666 :: Replies: 34 :: Views: 10747
The component references are not on the schematic but I think I can see what is going on.
I think it uses a zero, or close to zero IF by running the oscillator very close to the signal frequency then uses a pulse counting detector to recover the audio. A similar design was available commercially in the UK back in the 1970s. Perf
Hobby Circuits and Small Projects Problems :: 22.01.2010 13:59 :: betwixt :: Replies: 1 :: Views: 4407
schematic & simulation result attached.
RF, Microwave, Antennas and Optics :: 27.05.2010 05:18 :: zeshan102 :: Replies: 13 :: Views: 2067
Circuits like in Communications
Electronic Elementary Questions :: 07.08.2011 04:09 :: mister_rf :: Replies: 1 :: Views: 3740
I am Doing a project in wireless optical communication using laser 680nm. The signal is data from a Keypad by a UART using PIC 16f877A which is send to LASER using an OP-AM circuit Given In schematic.
I need to receive this signal (UART) from a Phototransistor 2N5777 and regenerate the data by another PIC16F877a and display it correct
RF, Microwave, Antennas and Optics :: 11.12.2011 11:13 :: demetal :: Replies: 2 :: Views: 355
Attached is a schematic that now only resembles the UHF receiver I have been designing. It simulates fine but when placed on a board it required alot of modifications to get working.
Anyway I can inject a signal at the Antennae port at -100dbm and view the signal on the spectrum analyzer after the saw filter at -90dbm. The oscillator wor
RF, Microwave, Antennas and Optics :: 01.03.2012 23:02 :: darcyrandall2004 :: Replies: 2 :: Views: 896
Q1 bias reaches ground through the load and the transistor at bottom right.
It can work if the load is conducting during that time.
I am trying a simulation of your posted schematic. The portion at right is a way to make the transistors conduct and turn off alternately, to cooperate with the portion at left, in order to result in H-bridge (...)
Electronic Elementary Questions :: 08.06.2012 21:28 :: BradtheRad :: Replies: 1 :: Views: 421
You need to tell us more.
Especially, "the current has to flow in 2 directions".
Usually, you have one power supply, (in this case with 5V output) and the current flows
from this power supply to some kind of load. Do you need a switch between the power
supply and the load, and this switch triggered from as mall signal?
Could you draw a sche
Microcontrollers :: 05.05.2013 09:52 :: doraemon :: Replies: 3 :: Views: 147
Of course, you can do that like standalone circuit with or without mcu. Use any of above 3-pin ICs and connect them like on schematic and pass to mcu input pin or to base of some transistor.
Example with mcu (12c508 or 12c509) link:
You can do this with any mcu (PIC,AVR,...)
Example with standar
PC Programming and Interfacing :: 13.01.2003 13:27 :: meax98 :: Replies: 8 :: Views: 3669
Usually to work on the mobile phones you MUST have:
1) schematic diagram;
2) Good experience;
3) Mobile tes instruments.
Anyway, let's try to solve the problem.
a) If the signal strenght is weak, but is possible to receive the call, this means that the I/Q demodulator and the Local oscillator are working properly;
b) Check the pin diodes us
RF, Microwave, Antennas and Optics :: 19.01.2004 18:55 :: FANT :: Replies: 12 :: Views: 2635
Hi,Puppet1,Can you upload the schematic first?
Analog IC Design and Layout :: 19.10.2004 09:17 :: thcm :: Replies: 6 :: Views: 1638
Can anyone share designs or schematic on CB transceiver for an AM band and for FM will be better if its a simple one.
Hobby Circuits and Small Projects Problems :: 20.06.2005 02:58 :: Weis Guy :: Replies: 2 :: Views: 1640
pls can you tell me at which point the rf encoder and decoder will connect to this circuits
You have posted an incomplete schematic and asking a wrong question.
the circuit is a silly RF transmitter. You need to search for the receiver as well.
Post them both, and ask exactly what do you want to do with those...
Hobby Circuits and Small Projects Problems :: 02.02.2008 10:51 :: melc :: Replies: 6 :: Views: 1983
I don't know which part your looking for a substitute for.
I did a search for 1018 on digikey.
This was the hit. 60V 79A hexfet,... not a part common to a IR receiver.
If you show a schematic to the analog group, they may be able to suggest a component.
Microcontrollers :: 25.08.2008 16:58 :: treitmey :: Replies: 1 :: Views: 397
I am trying to drive 3 ir leds from an ic using the following schematic :
This seemed to work for a while but at my receiver i am getting a strange offset value as if the transistor cant turn the led's truly off at any time. Any
RF, Microwave, Antennas and Optics :: 21.06.2011 18:28 :: Miltaridis :: Replies: 1 :: Views: 273
Show us schematic of transmitter and receiver block
Microcontrollers :: 29.10.2011 15:50 :: kak111 :: Replies: 1 :: Views: 216
Maybe your physical circuit works fine, but what I said is, the schematic you posted is wrong.
RF, Microwave, Antennas and Optics :: 10.09.2012 01:31 :: vfone :: Replies: 7 :: Views: 482
you need to put your schematic here or provide some more details regarding your question.
Microcontrollers :: 30.09.2012 01:10 :: Jigar 4 Electronics :: Replies: 2 :: Views: 311
in the following picture, the schematic is a part of an ir receiver, here is a twin-t notch filter and a non-inverting amplifier.
in the notch filter, R is programmable (s), and switch here is nmos transistor (having body effect), when simulation(assuming s=100), in some corner, the leakage current of s is 25nA also, causing a voltage
Analog Circuit Design :: 30.11.2012 08:56 :: lhlbluesky :: Replies: 2 :: Views: 147
It isn't the schematic that causes the problem, it's the construction and choice of component materials. Even a simple single transistor oscillator will work fine under ideal conditions but might drift wildly as temperature changes or something moves nearby. The one you show in post #9 should be OK provided:
1. you stabilize the supply voltage
Analog Circuit Design :: 13.01.2013 04:25 :: betwixt :: Replies: 24 :: Views: 1294
This is a circuit of tv transmitter, but this circuit works for both video and audio (specially audio).
Analog Circuit Design :: 14.03.2013 07:05 :: Genovator :: Replies: 6 :: Views: 707
Hello, I am trying to build an RF FM Transmitter that transmits from 88 Mhz- 108 Mhz but I am having a very difficult time doing so. The transmitter I have tested works on a breadboard, which I read is not suppose to due to high capacitance, but for some reason and luck it does work. The problem is when I try and prototype it on a perfboard or anyt
Embedded Systems and Real-Time OS :: 20.06.2013 11:18 :: Electrojosh86 :: Replies: 0 :: Views: 10
In transistor amplifiers we need to adjust the DC voltage and current through the transistor to get an optimum operating point. This is done by the resistors in your picture and the structure is called the "DC bias network".
When this is done, you need to add an AC or audio or RF signal to transistor base without disturbing the DC setting. (...)
Analog Circuit Design :: 05.08.2013 03:14 :: jiripolivka :: Replies: 3 :: Views: 351