Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
hi,
i use the LMH6551 like the schematic attached.
with power 12V the LMH6551 burns and Vcm goes at 11V.
i do not understand whi this appens,because in the datasheet the maximun supply voltage is 13.2V
anyone as any idea?
thanks
The range of frequency is about 300Hz- 4KHz
whit L1 and L2 the BLOCK1 and BLOCK2 see high impedance to DC generator, if I put a capacitor in parallel their, the impedance in audio band decrease.
L1 and L2 should be greater for to see more high impedance
I enclose the full scheme
In BUS1 and BUS2 there are audio and power (28V)
BLOCK1 and BLOCK2 talk and listen and vice versa
When send the audio signal from AUDIO-IN of BLOCK-1, at the out AUDIO-OUT of the same block there should be no signal, because IC1 sum signal and cancel them if the...
this is part of a more complex circuit
instead of the trasformerr could be a capacitor and the phase is the same
ground on the right is the mass of the entire circuit
Hi,
I have a problem with this circuit:
AUDIO-IN is a sine wave that goes from 300Hz to 4KHz.
the sigals OUT1 and OUT2 should be 180 degrees out of phase.
but they are out of phase about of 110 degrees.
I don't understand why.....
This is a problem for my application.
someone could help me...
Re: AD8017
thanks...
but, where are the fig. 38 and 39 on the datasheet????
there are only 12 figures...
If i use the AD8017 whit gain=2 whit 2k2 resistance in the feedbak to drive 100 Ohm balanced line, there are problem????
thanks..
AD8017
Hi,
I use AD8017 to drive 100 Ohm balanced line.
I use AD8017 like inverter amplifier with gain=3
The circuit work wery well..
If i connect the OUT of AD8017 whit negative input(voltage follower) and i connect the positive input at VCC/2 the IC burns...(the AD8017 is connect at single...
Yes, you are right ,without load is extreme condictions
normally it works whit antenna...
but, if I cover the antenna whit hand (is possible because it is a portable trasmitter), it is difficult to hope the antenna is perfectly matched...
I dont' want to work without load,
I tested my circuit on extreme condictions because it is a portable equipment, and the antenna can be mismatched whit hand and the efficency of the system worsens
the current of the system goes high and battery discharges fast
I would like to reduce the...
This circuit is the final RF amplifier of portable radiocontrol,
the problem is that I mismatch the antenna whit my hand, during the normal operation, the efficency goes low and the battery discharges more fast
I attach for you my circuit
In origin I used the BFG520 at Vcc=5V, but now I use the 2SC5754 at Vcc=3V
I set Vbias for Icq= 15 mA without RF signal
When I drive the PA whit RF signal at 915 MHz 13 dBm, I get Pout=24 dBm
whit Ic= 120 mA, the efficency is about 70%...This is good for me...
but, then depends of type of the transistor???
for my application, I use the 2SC5754, this is used for cellular,i think is good
but the mismatch load is NOT defined on data sheet........
If I use BFG21W for my application, is better????
the mismatch load is defined 6:1
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
