Stable simple dc amplifiers

Started by Archival in sci.electronics.design9 years ago 32 replies

I need a simple(=3D cheap) relatively stable(temp and noise) dc amplifier t= hat can take a voltage from 0 to 5V and output from around 0V(not...

I need a simple(=3D cheap) relatively stable(temp and noise) dc amplifier t= hat can take a voltage from 0 to 5V and output from around 0V(not critical)= to near Vcc(but arbitrary) somewhat linearly. I'm thinking a simple bjt amplifier with temp compensation will work decent= ly but the issue is linearity and range. e.g., the output voltage of an ideal CE amplifier is Vout =3D Vcc - Rc...


Re: Why Adding a Voltage Amplifier after a Transimpedance Amplifier reduce BW? Book Claim by 0.64

Started by Felipe Jimenez in sci.electronics.design5 years ago

On Thursday, May 14, 2015 at 8:52:55 AM UTC-7, Felipe Jimenez wrote: > On Thursday, May 14, 2015 at 4:08:04 AM UTC-7, Phil Hobbs wrote: > > >...

On Thursday, May 14, 2015 at 8:52:55 AM UTC-7, Felipe Jimenez wrote: > On Thursday, May 14, 2015 at 4:08:04 AM UTC-7, Phil Hobbs wrote: > > > Oh and I'm fairly certain the non-inverting amplifier is wired up correctly. Between > > > switching back and forth from the non-inverting to the inverting configuration > > > several times, I am fairly certain that both configurations were wire...


PAM amplifier in NON smd version

Started by gm in sci.electronics.design3 years ago 2 replies

Is there one ? I need to make one adapter board and this amplifier should be mounted on this board...

Is there one ? I need to make one adapter board and this amplifier should be mounted on this board...


Re: Why Adding a Voltage Amplifier after a Transimpedance Amplifier reduce BW? Book Claim by 0.64

Started by John Larkin in sci.electronics.design5 years ago

On Thu, 14 May 2015 08:52:51 -0700 (PDT), Felipe Jimenez wrote: > On Thursday, May 14, 2015 at 4:08:04 AM UTC-7, Phil Hobbs wrote: > > >...

On Thu, 14 May 2015 08:52:51 -0700 (PDT), Felipe Jimenez wrote: > On Thursday, May 14, 2015 at 4:08:04 AM UTC-7, Phil Hobbs wrote: > > > Oh and I'm fairly certain the non-inverting amplifier is wired up correctly. Between > > > switching back and forth from the non-inverting to the inverting configuration > > > several times, I am fairly certain that both configurati


Re: Why Adding a Voltage Amplifier after a Transimpedance Amplifier reduce BW? Book Claim by 0.64

Started by George Herold in sci.electronics.design5 years ago

On Thursday, May 14, 2015 at 11:57:36 AM UTC-4, Phil Hobbs wrote: > On 05/14/2015 11:50 AM, John Larkin wrote: > > On Thu, 14 May 2015...

On Thursday, May 14, 2015 at 11:57:36 AM UTC-4, Phil Hobbs wrote: > On 05/14/2015 11:50 AM, John Larkin wrote: > > On Thu, 14 May 2015 04:07:59 -0700 (PDT), Phil Hobbs > > wrote: > > > > > > Oh and I'm fairly certain the non-inverting amplifier is wired up correctly. Between > > > > switching back and forth from the non-inverting to the inverting configuration > > > > several


Video amplifier IC

Started by Bitrex in sci.electronics.design9 years ago 14 replies

I'm trying to remember the name of a video amplifier IC - it's an old Motorola chip and I recall that the internal circuit was basically...

I'm trying to remember the name of a video amplifier IC - it's an old Motorola chip and I recall that the internal circuit was basically a common emitter feedback triple with a pin for external compensation. MC????


Common collector amplifier and amplitude modulation

Started by Anonymous in sci.electronics.design1 year ago 20 replies

Could some electronics guru here shed some light on this Could a single stage common collector amplifier exhibit amplitude modulation ? I have...

Could some electronics guru here shed some light on this Could a single stage common collector amplifier exhibit amplitude modulation ? I have the SPICE model of a simple common collector amplifier consisting of two base bias resistors, a collector resistor and an input and a output DC blocking capacitor, as well as a source and a load resistor of 50.0 Ohm. The BJT collector is connected to ...


Need help to design a transimpedance amplifier

Started by T Obulesu in sci.electronics.design4 years ago

Hello Guys.. Could you please help me in designing a trans impedance amplifier with single supply...? 1. I need to detect small currents...

Hello Guys.. Could you please help me in designing a trans impedance amplifier with single supply...? 1. I need to detect small currents from 50 nA to 100 micro amps with the resolution of 100mV for every 100 nA on the scale of 5 V


JFET Common Source Amplifier as counterpart of BJT Common Emitter Amplifier

Started by Patrick Chung in sci.electronics.design7 years ago

JFET Common Source Amplifier as counterpart of BJT Common Emitter Amplifier has (on average) smaller voltage gain, higher input impedance, higher...

JFET Common Source Amplifier as counterpart of BJT Common Emitter Amplifier has (on average) smaller voltage gain, higher input impedance, higher non-linearity and can operate on higher frequencies. It now can be simulated on: http://www.cirvirlab.com/simulation/jfet_common_source_amplifier_online.php and read on: http://www.cirvirlab.com/index.php/tutorials/126-jfet-common-source-amplifi...


Micro-power audio amplifier

Started by ozzy in sci.electronics.design9 years ago 7 replies

Hi, I want to have a go at building the amplifier shown on page 952 (fig 14.29) of AofE (2nd ed). However I can't get a hold of...

Hi, I want to have a go at building the amplifier shown on page 952 (fig 14.29) of AofE (2nd ed). However I can't get a hold of the transistors used: (NPN) MPS6547 and (PNP) 2N4957. Does anyone know where those parts can be obtained from, or if any direct replacements were ever made? Cheers, Osman.


Re: Why Adding a Voltage Amplifier after a Transimpedance Amplifier reduce BW? Book Claim by 0.64

Started by Felipe Jimenez in sci.electronics.design5 years ago

On Thursday, May 14, 2015 at 9:15:16 AM UTC-7, Phil Hobbs wrote: > On 05/14/2015 11:52 AM, Felipe Jimenez wrote: > > On Thursday, May 14,...

On Thursday, May 14, 2015 at 9:15:16 AM UTC-7, Phil Hobbs wrote: > On 05/14/2015 11:52 AM, Felipe Jimenez wrote: > > On Thursday, May 14, 2015 at 4:08:04 AM UTC-7, Phil Hobbs wrote: > > > > Oh and I'm fairly certain the non-inverting amplifier is wired up > > > > correctly. Between switching back and forth from the > > > > non-inverting to the inverting configuration several times, I am > > > > fair


how to test lock-in amplifier

Started by kellyb in sci.electronics.design5 years ago 3 replies

Is there a simple circuit to test a lock-in amplifier? I bought one off ebay but don't want to spend lots of time setting it up if the thing...

Is there a simple circuit to test a lock-in amplifier? I bought one off ebay but don't want to spend lots of time setting it up if the thing doesn't work. Any help much appreciated. kelly


Re: Why Adding a Voltage Amplifier after a Transimpedance Amplifier reduce BW? Book Claim by 0.64

Started by John Larkin in sci.electronics.design5 years ago

On Thu, 14 May 2015 09:15:53 -0700 (PDT), George Herold wrote: > On Thursday, May 14, 2015 at 11:57:36 AM UTC-4, Phil Hobbs wrote: > > On...

On Thu, 14 May 2015 09:15:53 -0700 (PDT), George Herold wrote: > On Thursday, May 14, 2015 at 11:57:36 AM UTC-4, Phil Hobbs wrote: > > On 05/14/2015 11:50 AM, John Larkin wrote: > > > On Thu, 14 May 2015 04:07:59 -0700 (PDT), Phil Hobbs > > > wrote: > > > > > > > > Oh and I'm fairly certain the non-inverting amplifier is wired up correctly. Between > >


Op-amp Summing Amplifier

Started by Patrick Chung in sci.electronics.design6 years ago 7 replies

Good feature of op-amp summing amplifier is that there is direct current path provided from every input to the output. For that reasons input...

Good feature of op-amp summing amplifier is that there is direct current path provided from every input to the output. For that reasons input voltage sources don't need to have current sink capability. Good feature of op-amp non inverting summing amplifier is that output voltage is proportional with the sum of the input signals, and with the same sign. Bad feature is that there is no


Class E amplifier question

Started by amal banerjee in sci.electronics.design11 months ago 5 replies

Here is a question for all electronics gurus here. Can a class E amplifier be termed efficient - given the shunt capacitor from BJT collector...

Here is a question for all electronics gurus here. Can a class E amplifier be termed efficient - given the shunt capacitor from BJT collector to ground, which is an AC short -- unless the capacior value is very small, such that the capacitive reactance is large. Any flaws in this argument ?


Op-amp instrumentation amplifier is initial input stage of EKG and EEG instruments

Started by Patrick Chung in sci.electronics.design6 years ago 3 replies

Op-amp instrumentation amplifier is initial input stage of EKG and EEG instruments due to it's high impedance, very high common-mode rejection...

Op-amp instrumentation amplifier is initial input stage of EKG and EEG instruments due to it's high impedance, very high common-mode rejection ratio, and very high voltage gain. Read more: http://www.cirvirlab.com/index.php/tutorials/162-op-amp-instrumentation-amplifier.html and simulate online: http://www.cirvirlab.com/simulation/op-amp-instrumentation-amplifier-online.php


Amplifier, adc driver

Started by Anonymous in sci.electronics.design6 years ago 7 replies

Hello, I'm looking for a schematic of the amplifier with band from DC to 100 MHz and impedance 1Mohm for 14bit ADC converter. I googled only...

Hello, I'm looking for a schematic of the amplifier with band from DC to 100 MHz and impedance 1Mohm for 14bit ADC converter. I googled only simple solutions based on eg AD8138 with trafos and imput impedance only 50 ohm Any sugestion? Peter


how to optimize for multistage gain selection

Started by Anonymous in sci.electronics.design1 year ago 31 replies

I'm trying to design a two stage amplifier for a sensor readout and I would like those stages to be configurable, but I also need to have the...

I'm trying to design a two stage amplifier for a sensor readout and I would like those stages to be configurable, but I also need to have the overall gain vs. configuration curve to be such that every new step is ~5% increase w.r.t. the previous. So let's say I have 3 control bits on the first amplifier and 4 for the second, how would I design the set of values those gains need to be at? Is the...


200V amplifier

Started by maxascent in sci.electronics.design9 years ago 18 replies

I need an amplifier that can amplify a 5V p-p (range 5V to 0V) signal to 200V p-p (range 200V to 0V). The bandwidth needs to be at least 500...

I need an amplifier that can amplify a 5V p-p (range 5V to 0V) signal to 200V p-p (range 200V to 0V). The bandwidth needs to be at least 500 kHz. Does anyone know of a circuit or maybe an opamp that is capable of this? TIA Jon --------------------------------------- Posted through http://www.Electronics-Related.com


Amplifier transistor substitution.

Started by Sylvia Else in sci.electronics.design4 years ago 20 replies

The smoke escaped from my old oscilloscope today. I've determined that it came out of R740, to the bottom right of the circuit...

The smoke escaped from my old oscilloscope today. I've determined that it came out of R740, to the bottom right of the circuit diagram. https://www.dropbox.com/s/9053dnyr0izv88r/XAMP.PDF?dl=0 This is because T711 has shorted out. Not very surprisingly I cannot source a replacement BF472, so I need to find a substitute. This is the final X-axis amplifier, so we're not talking high ...