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faizanbrohi
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Posts posted by faizanbrohi
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Well in my country there are no Radio cops to whom i have interferance . so no problem there. about the R5 resistor yes the other end is backwards ,well i guess i have to redaraw the schematic and PCB with your settings now lets see .
ok i will use a 0.1uf because i have one . for the inductors . well they are not the actual values i have approximatied them , please see the original website and see how they are made. And for The transistors , i think i will go with BF199, MPSH10, BF240 , 2N3926 , MRF237 will do fine as all are RF Transistors. i think bf199 and bf240 are fine RF Transistors and easy to find. -
Here is a PCB layout and shcematic for my latest TX-500 500mW FM Transmitter i am building for my RC Remote controlled car using DTMF Signals to control it .
I have not build it but this will hopefully be my 3rd transmitter project . from 40mW and 10mW to 500mW . Well hope this works . I found the schematic on www.electronics-diy.com and then redrawned it and made a PCB . Later i will make the Reciever and the DTMF Encoder and Decoder.
THere is one problem the 4.7uF capacitor is i think a non polar and the 47uF is also a non polar capacitor but well i can go with a 4.7uf to be non polar but a 47uF , i don't think so or it might be bipolar.
The Red connection on the PCB Layout is for a jumper that was not routed correctly . it might be connected on the bottom side using insulated copper wire.
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so you are saying we can invert it but the voltage will be less , i mean if we give the OPA548 60v and give it input 60v also and use inverting configration will it not produce -60 at the output
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actually it is you can operate it on a single supply see this application note of OPA548 http://www-s.ti.com/sc/psheets/sboa059/sboa059.pdf
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Well THere can be another way why not invert the voltages using TI OPA548 configured as an inverting amplifier with gain 1 , ie configured as a voltage regulator
it is capable of 60V @ 3A (3000mA) , since it has inverting negative ouptut it will work . -
I think you are right but the problem is that is there any converter capable of Positve to negative voltage conversion having high amperage . or any other distinct method to convert positive to negative
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Hello Everyone , this is faizanbrohi again to discuss yet another project design . actually it is related to building a Power supply for car audio using a IC UC2577-ADJ and fits the need Perfectly for a 12V battery step up psu.
Main Page : http://focus.ti.com/docs/prod/folders/print/uc2577-adj.html
Datasheet : http://www-s.ti.com/sc/ds/uc2577-adj.pdf
Application Note : http://www-s.ti.com/sc/psheets/slua181/slua181.pdf
The application note discusses a supply for a automotive application but has less voltage specification and less current specification . The absoulute maximum rating is good for my design as i require +55V and -55V @3A or @6A so since this is a single mode supply , We can make two identical units and then joing them serialy like two voltage sources producing +55 and -55V . Sounds Really Good , But SOme Calculation is needed . The Datasheet is very comprehensive in providing the adequate information for each and every thing. THere is only theoratical Calculations THat need to be done .
The Pictures For the Block Diagram are included and the Absoulte Ratings along the Note .
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" Are you a ghost hunter? Then this is the circuit that you've been waiting for! Since it has been observed that appearance of a ghost tends to disturb the EMF, you can now detect any such changes with this little detector."
I think we are hunting ghosts with this meter -
HEllo again , everything is working fine , the only problem now is the brightness of the LED how to increase the brightnesss of the LED.
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If only Texas Instruments would have an ACTIVE status on the TAS5152 Evaluation board , it would have beeen possible for us to actually get the USer guide at least , where all the PCB Layout and gerber files are given .
can i use SG3525 PWM Controller IC With this , it is also a PWM Controller -
i think a evaluation board is neccesary to implement this . but the problem is that i cannot buy the evaluation board in my country , one of my relatives live there in toronto but i bet they don't know the location , audioguru you also live in canada , can you check out the Texas instruments distributer in toronto and look if they have an evaluation board for the TS5152 - 5508 , because iin the texas instruments site , it only says status : PREVIEW for it . but you can buy it from the distubuter , better go check it out... thnx
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Here are the schematics any ideas about where is the input and ouput , because first i want to try out the 125W audio amplifier and see if it works. THe problem is that the TAS5152 side is easy to tackle and understand but i donot understand the PWM Section of where is the Input signal and how to implement it ... ??
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I have ordered 5 samples of TAS5152 , TI has shipped it to FedEx , it will be here on 3 august 2006 , but i think it will be delayed because of rainy weather in my country.
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Can you attach the suggested parts list . i have everything except the OPA series Op amps , can you suggest any other opamp.
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Ok i get it the peak detector is just producing fluctuating DC Voltages. so it works like a ADC , with DC Voltages ofcourse . LM3915 is nothing but a bunch of comparators. simple. here is the final Schematic , i think now there is no problem.. thnx
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Who says it is out of production . IT is in full production , look at the picture attached . ANd farnell also has it . But the problem is that the PWM IC LM4651 is out of production , can you tell me about the IC number of the Texas Instruments CLass D Amplifier IC. thnx
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So this means that the output of the preamp also goes in the peak detector circuit and the peak detector circuit powers the LM3915 IC as well as the LED's , here is the modified schematic , i want a trimpot for the sensitivity for the signal where could i implement it . And one more thing , is there a replacement for LF351 , can i use LM741 or TL071 , TL081 in place of it.
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I have found a way , why not use a Class D amplifier after generating a modified sine wave or a linear sine wave . We can use LM4652 and LM4651 to make a Class D amplifier. Here is a schematic for it . IF it has 125W efficiency 86% , it can be used for sine wave generation also .
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Hello and i am really really happy today it was raining. i enjoyed the rain very much . after all those warm and humid days , finally the weather is really good now .
Well Here is a look at the LM3915 again , and now it is is using DC 12V with a half wave peak detector circuit . i am just asking if the sensitivity can be adjusted and since it can , will it work good when connecting it to the TL071 preamp .
THere is one dotted line , does it need to be shorted or not??
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Well HEllo again , i have modified the schematics and well here is a schematic for the bass and treble control and the Aduio VU LED Meter , i want to keep the circuit as simple as possible. because i don't have enough space.
So , the first circuit as you said i have used the input coupling capacitor of the preamp to the bass treble control and then back to the audio taper / power amp .
The second circuit is a simple LED VU Meter because i just want to use a it after the Preamp , so is there any problem.
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Well Hello again Audio Guru , how r u . well i have built the power amp successfully , now i am thinking to add flavour in it and found some problems with my flavours . One is the Bass and Treble Control and the other is a Audio VU meter , i want to keep the circuit as simple as possible . here is a illustration for it , as you can see in the first diagram , i not need first opamp as i have the preamp control and i don't even need a mixer after the bass treble control because there is only one input , and my amp is mono. FOr the second circuit it is using AC , i don't have any ac input , only DC from other Power supply , can i use dc for its VCC and i also need a dual VCC - and + so i will use a ICL7660... So any suggetions ideas .
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How do i drive mosfets for a modified sine wave .
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Can this RF Power amp be used with any FM Transmitter too
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How about implementing Sasi's circuit with the osillator i posted above .
RC-(remote controlled) Car
in Electronic Projects Design/Ideas
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here is the modified Schematic of the things you posted. And it is also written in the title checked by AUDIO GURU .. ;D Well i think you should join the www.electronics-diy.com community also , It is in a beta stage so it is growing.