Amp Power Supply

Started by Dave.H in sci.electronics.basics9 years ago 2 replies

I'm building an amplifier for my iPod, based on two LM380 chips, I was wondering if you could parallel the two amplifier sections off the...

I'm building an amplifier for my iPod, based on two LM380 chips, I was wondering if you could parallel the two amplifier sections off the one battery supply, which will be a 9 volt battery in series with two AAA batteries. Amplifier circuit: http://www.guidecircuit.com/Circuit-Audio-LM380-PERSONAL-STEREO-AMPLIFIER.htm Thanks, Dave Australia


WHAT IS A TUNED AMPLIFIER?

Started by jekob in sci.electronics.basics8 years ago 5 replies

I NEED A HELP ON A TUNED AMPLIFIER JUST ALITTLE LECTURE NOTES ON TUNED AMPLIFIER WITH BJT AND FET ALSO AND THIER GAIN AND EVERY THING ABOUT THEM

I NEED A HELP ON A TUNED AMPLIFIER JUST ALITTLE LECTURE NOTES ON TUNED AMPLIFIER WITH BJT AND FET ALSO AND THIER GAIN AND EVERY THING ABOUT THEM


Op-amp differential amplifier

Started by Patrick Chung in sci.electronics.basics3 years ago

Op-amp differential amplifier has much wider range of input signals comparing to differential amplifier with discrete components. Read...

Op-amp differential amplifier has much wider range of input signals comparing to differential amplifier with discrete components. Read more: http://www.cirvirlab.com/index.php/tutorials/170-op-amp-differential-amplifier-simulation.html and also simulate: http://www.cirvirlab.com/simulation/op-amp-differential-amplifier-online.php


current amplifier question (with a little LabVIEW)

Started by panfilero in sci.electronics.basics11 years ago 5 replies

Hello, I need to design a current amplifier. I'm trying to design a virtual instrument in LabVIEW to which I can type in a current (for example...

Hello, I need to design a current amplifier. I'm trying to design a virtual instrument in LabVIEW to which I can type in a current (for example 1.5 Amps) and then have that current realized at the output of a current amplifier. I believe LabVIEW will provide a small voltage which I can feed into the current amplifier and then use the output of that. I'm going to be using this to drive a ...


Operational Amplifier basics

Started by Rich in sci.electronics.basics9 years ago 36 replies

I'm trying to understand Op Amps first time round. Are the following statements correct? I've rushed it a bit, so most of it might look...

I'm trying to understand Op Amps first time round. Are the following statements correct? I've rushed it a bit, so most of it might look like nonsense. Please correct or amplify. 1 An Op Amp is basically a DIFFERENTAL amplifier. 2 Unlike a (for want of a better word) a "regular" amplifier, an Op Amp can have two input voltages. 3 When the Op amp is run as a DIFFERENTIAL ampl...


AGC circuit ... threshold amplifier question

Started by MRW in sci.electronics.basics11 years ago 12 replies

I have this circuit: http://tinypic.com/view/?pic=333cv43 I encountered this threshold amplifier circuit. I'm trying to understand how it...

I have this circuit: http://tinypic.com/view/?pic=333cv43 I encountered this threshold amplifier circuit. I'm trying to understand how it works. So far, it seems like it is just a summing amplifier and op amp rectifier combined. I used superposition to find out the voltage at the inverting input (V-), but after looking at the mess of equations I still can't relate the functions of each co...


being shocked by Amp casing

Started by RobZ in sci.electronics.basics9 years ago 13 replies

hi all, perhaps slightly off-topic but you guys have been of great help to me in the past When I was installing a new hifi amplifier last...

hi all, perhaps slightly off-topic but you guys have been of great help to me in the past When I was installing a new hifi amplifier last night, I realised i was being lightly shocked each time i touched the amplifier case while I was lying on the floor trying to re-route some of the speaker cables behind the cabinet. The shock is definatly between the Amplifier case and the floor. ( no ...


Regarding Amplifier

Started by Anonymous in sci.electronics.basics11 years ago 6 replies

Hi,Iam Amit.I want to make an amplifier for my electric Guitar.How can i build it.

Hi,Iam Amit.I want to make an amplifier for my electric Guitar.How can i build it.


amplifier

Started by chra...@gmail.com in sci.electronics.basics11 years ago 20 replies

wat is the use of emitter resistor & bypass capacitor for any amplifier?

wat is the use of emitter resistor & bypass capacitor for any amplifier?


And Now For Something Completely Different

Started by Ron Hubbard in sci.electronics.basics10 years ago 4 replies

Does anybody know of a schematic for an amplitude modulated amplifier? Yes, I do mean *amplifier.* Ron

Does anybody know of a schematic for an amplitude modulated amplifier? Yes, I do mean *amplifier.* Ron


loud class AB amplifier

Started by Anonymous in sci.electronics.basics10 years ago 5 replies

LM386 when operated from 6 volts can give sufficiently loud sound. Would it be possible to design class AB amplifier which can give that kind...

LM386 when operated from 6 volts can give sufficiently loud sound. Would it be possible to design class AB amplifier which can give that kind of loudness but with only 3 volts battery. Can I just use single stage class AB amplifier or .... what. Thank you in advance C


muting class a/b amplifier

Started by Pat in sci.electronics.basics11 years ago 12 replies

Any ideas on the best way to mute/blank the output of a 400 watts RF solid-state amplifier ( < 50 mhz) for pulsed (microsecond) operation?

Any ideas on the best way to mute/blank the output of a 400 watts RF solid-state amplifier ( < 50 mhz) for pulsed (microsecond) operation?


Solve noise for amplifier

Started by Chauny in sci.electronics.basics10 years ago 2 replies

Hello people, I make a amplifier circuit with TDA2030, the amplifier works but when i connect it to loudspeaker, turn on the power, i hear...

Hello people, I make a amplifier circuit with TDA2030, the amplifier works but when i connect it to loudspeaker, turn on the power, i hear noise from loudspeaker without input. I can not solve this problem although i make layout with center ground. Could anybody help me solve this problem? Regards, Chauny.


Signal amplifier works

Started by Uncle Steve in sci.electronics.basics5 years ago 88 replies

... unless there is no signal at the input. I started with some information at the following two...

... unless there is no signal at the input. I started with some information at the following two URLS: http://www.mysticmarvels.com/amplifier.html http://www.talkingelectronics.com/projects/TheTransistorAmplifier/TheTransistorAmplifier-P1.html The first URL goes through the process of building a high-gain amplifier, and it works O.K. with the exception that there is no power. The seco


Differential Amplifier is an input stage of every op-amp

Started by Patrick Chung in sci.electronics.basics3 years ago

Generally, if input stage of an operational amplifier is realized as BJT tr= ansistor differential amplifier, op-amp has smaller slew rate,...

Generally, if input stage of an operational amplifier is realized as BJT tr= ansistor differential amplifier, op-amp has smaller slew rate, smaller volt= age offset and better CMRR. If it's realized as JFET transistor based diffe= rential amplifier, voltage offset is higher, CMRR is smaller but slew rate = is better.=20 Read more: http://www.cirvirlab.com/index.php/tutorials/167-bjt-tran...


Re: Bipolar vs FET: Def. and when to use one or the other?

Started by default in sci.electronics.basics11 years ago 16 replies

On Sat, 10 Mar 2007 09:58:03 GMT, Dr. Leonard H. McCoy wrote: > In school (if memory serves) I learned that a bipolar transistor is a >...

On Sat, 10 Mar 2007 09:58:03 GMT, Dr. Leonard H. McCoy wrote: > In school (if memory serves) I learned that a bipolar transistor is a > current-controlled current "amplifier", and that a FET is a > voltage-controlled current "amplifier". Replace "amplifier" with "switch" to > complete the 2x2 matrix I learned about most uses for active devices. > > Is this -- on the basi


designing a radio amplifier

Started by atheist in sci.electronics.basics9 years ago 4 replies

Hi guys. have recently graduated with mechanicanical engineering. Here i'm faced with challenge of coming up with amplifier. specs:input 12v, I

Hi guys. have recently graduated with mechanicanical engineering. Here i'm faced with challenge of coming up with amplifier. specs:input 12v, I


Audio amplifier (part 2)

Started by Olivier Scalbert in sci.electronics.basics9 years ago 27 replies

Hello, it is me again ... After "jouling" some transistors, I decide to move to LTSpice. Which is funny as I am doing electronics as hobby to...

Hello, it is me again ... After "jouling" some transistors, I decide to move to LTSpice. Which is funny as I am doing electronics as hobby to change from being in front of computers all day long ! I have some questions on this schema: http://scalbert.dyndns.org/electronics/amplifier/schema1.png Simulation is here: http://scalbert.dyndns.org/electronics/amplifier/simul1.png I hav...


designing a base bias grounded emitter amplifier.

Started by Anonymous in sci.electronics.basics10 years ago 13 replies

I'm a EET student and I have to find values for a base bias grounded emitter amplifier given the following properties. a. Beta DC,and AC are...

I'm a EET student and I have to find values for a base bias grounded emitter amplifier given the following properties. a. Beta DC,and AC are both 160 b.Vbe= 0.7V c.Tj=72 degrees ferenhiet, or Vt =25.5mV d. Q point Vce=Vc=0.5Vcc e. Unloaded Voltage gain Av = -100 f. Output resistance = 2Kohms. I have to find theses values for the amplifier. a.Rc b. r'e c.ie d. VCC e. Rb f.Rin (inp...


Reason for heating caused due to PH2931-135S microwave amplifier ?

Started by Sanoj Singh in sci.electronics.basics4 years ago

I am working on development of RF driver input for Klystron amplifier. As usual, pulsed output of PH2931-135S microwave amplifier (input to...

I am working on development of RF driver input for Klystron amplifier. As usual, pulsed output of PH2931-135S microwave amplifier (input to amplif= ier provided after successive amplifications) on spectrum analyzer with 40 = dB external attenuation produces normal output of around 13dBm on the Spect= rum analyzer without any heating on the attenuator. But, today I am not getting the re...