Differential amplifier question.

Started by Syd Rumpo in sci.electronics.design4 years ago 10 replies

Hi I have a differential amplifier - LTC6362 if it matters, part of a much bigger circuit. Each input (from a differential source) is...

Hi I have a differential amplifier - LTC6362 if it matters, part of a much bigger circuit. Each input (from a differential source) is through two series Rs with a C from their midpoint to ground, like a T, to provide some HF rolloff. It works just fine. Of course, I could use a single half value C between the two midpoints and no ground connection. +in --R--+--R-- +amp ...


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

Started by Phil Hobbs in sci.electronics.design5 years ago

> Hey Phil...Just to clarify, you're suggesting a 2kohm resistor to gnd on all c-multiplier > outputs (3 of them: +/- 10V for the opamps and...

> Hey Phil...Just to clarify, you're suggesting a 2kohm resistor to gnd on all c-multiplier > outputs (3 of them: +/- 10V for the opamps and -10V for the PD), right? we'll try using a x10 > scope probe for the non-inverting configuration. So, Felipe, did that fix it? Cheers Phil Hobbs


Input Amplifier

Started by rickman in sci.electronics.design4 years ago 43 replies

I got help from Joerg some time back with an amplifier for an antenna signal for WWVB at 60 kHz. I was looking at a version in LTspice and...

I got help from Joerg some time back with an amplifier for an antenna signal for WWVB at 60 kHz. I was looking at a version in LTspice and noticed the bypass cap on the source leg of the second stage was a lot smaller than the others doing a similar job. It was reducing the gain of the second stage a bit and I increased it from 3.3 nF to 33 nF. Oddly enough, it dropped the gain of the ...


AMP, ADC, Transistor Questions!

Started by Anonymous in sci.electronics.design4 years ago 7 replies

Hello everyone. I am picking up on a project someone else worked and and I wanted to see if anyone had some ideas on a amplifier and ADC...

Hello everyone. I am picking up on a project someone else worked and and I wanted to see if anyone had some ideas on a amplifier and ADC connection that is being made in their schematic: 1.) See the schematic here: http://i1228.photobucket.com/albums/ee460/MrBlueCalifornia/qustion_zps3ck8j17m.jpg 2.) I am using a differenctial amplifier to measure a signal (U4 and U5 of schem


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

Started by Phil Hobbs in sci.electronics.design5 years ago

On 05/14/2015 12:59 PM, Felipe Jimenez wrote: > On Thursday, May 14, 2015 at 9:15:16 AM UTC-7, Phil Hobbs wrote: > > On 05/14/2015 11:52 AM,...

On 05/14/2015 12:59 PM, Felipe Jimenez wrote: > 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 inver


Small Design Error Saga

Started by Phil Allison in sci.electronics.design11 months ago 3 replies

Hi to my many friends, ----------------------- this story involves local Sydney electronics maker Jands, a few years ago. I know...

Hi to my many friends, ----------------------- this story involves local Sydney electronics maker Jands, a few years ago. I know Jands quite well, been to their factory many times. I know the particular amplifier, the SR3000, rated at 1500W per channel on music programme. I know the designer, Doug Ford - he has since appeared on U-tube. See pics of culprit amplifier: htt...


Stereo mixer amplifier

Started by Anonymous in sci.electronics.design12 months ago 22 replies

Greetings, An article about my stereo mixer-amplifier project is now available. http://crcomp.net/electronic/mixeramp/index.php Thank...

Greetings, An article about my stereo mixer-amplifier project is now available. http://crcomp.net/electronic/mixeramp/index.php Thank you, 73, -- Don Kuenz KB7RPU There was a young lady named Bright Whose speed was far faster than light; She set out one day In a relative way And returned on the previous night.


simple opamp amplifier circuit

Started by panfilero in sci.electronics.design8 years ago 23 replies

I'm simulating on LTSpice, a simple amplifier circuit with a 2.5V offset, but if I don't include a capacitor on my input my output hits the...

I'm simulating on LTSpice, a simple amplifier circuit with a 2.5V offset, but if I don't include a capacitor on my input my output hits the rails... why is this? The link shows what I'm doing in LTSpice thanks http://i555.photobucket.com/albums/jj477/panfilero/Capture-1.jpg


What REALLY are hearing aids?

Started by Anonymous in sci.electronics.design2 years ago 41 replies

I dont need a hearing aid, but I know someone who needs one and told me the cost. Unbelievably costly. I know nothing about them, but aren't...

I dont need a hearing aid, but I know someone who needs one and told me the cost. Unbelievably costly. I know nothing about them, but aren't they just an amplifier, with a speaker (like an earbud), and a tiny microphone? (and of course some sort of battery). If a person cant afford the commercial ones, why cant they rig up a small box, with a amplifier board, battery, and a small microp...


Power Amplifier for EEG Signals

Started by Anonymous in sci.electronics.design7 years ago 12 replies

Our group is attempting to build a low frequency amplifier (DC to 60Hz) capable of amplifying voltage potentials in plants to a level of 12Vpp...

Our group is attempting to build a low frequency amplifier (DC to 60Hz) capable of amplifying voltage potentials in plants to a level of 12Vpp at 1A. The idea is to drive a large visual display, based upon this activity, for demonstration purposes. To achieve this effect, there must be no significant delay between the input and output. What are the best design options for this applica...


Just for fun, the audiophile light amplifier

Started by Jan Panteltje in sci.electronics.design3 years ago 6 replies

Just for fun, the audiophile light amplifier Was reading about that audio tube, and wondering You now, clean energy, solar etc... So what...

Just for fun, the audiophile light amplifier Was reading about that audio tube, and wondering You now, clean energy, solar etc... So what if transmissive modulated changing LCD panel light voltage / current sun O --> -- light --> -- [] --> -- -> - ---> --- Ge photo diode --> -- -> - ---> --- headphones.


Solderless audio amplifier

Started by John Smith in sci.electronics.design7 years ago 40 replies

The radio kit hasn't arrived yet (Thread of 18th Jan. Probably due to weather conditions here in Ontario) so I thought I'd try my hand at making...

The radio kit hasn't arrived yet (Thread of 18th Jan. Probably due to weather conditions here in Ontario) so I thought I'd try my hand at making my own audio amplifier kit. The requirements were as follows: 1. Must use components I already have. I couldn't find any 1N4148 but did find packets of 1N4001 so that's what I used. Also I could only find one resistor under 1 ohm so another is...


7W IC amplifier

Started by chess in sci.electronics.design5 years ago 8 replies

Hi everyone I have a 7W IC amplifier,in its instruction it says DC voltage should be 12-16 volts.Connect the Audio source to IN and G and connect...

Hi everyone I have a 7W IC amplifier,in its instruction it says DC voltage should be 12-16 volts.Connect the Audio source to IN and G and connect 7W speaker to 'SPK'. I am supposed to use only lab equipment and no speaker I would like to know can I use function generator as a audio source and spectrum analyzer as a speaker to see the effect of amplification? Thanks ---------------------------...


OP-Amp disable

Started by Syd Rumpo in sci.electronics.design8 years ago 30 replies

I have an existing device with low-noise differential amplifier at the front end. It uses two LT6200 op-amps in inverting configuration and...

I have an existing device with low-noise differential amplifier at the front end. It uses two LT6200 op-amps in inverting configuration and has a gain of ten. Occasionally, that's too much gain, and an attenuator is pugged in in front of the amplifier. I want to make the gain electronically switchable without hurting the noise performance, so I want to avoid analog switches. Thes...


Need help to design a transimpedance amplifier

Started by T Obulesu in sci.electronics.design4 years ago 30 replies

Hello guys.. I want to design a trans-impedance amplifier to detect currents of the APD (in the range of 200 nA to 100 micro A). Could some...

Hello guys.. I want to design a trans-impedance amplifier to detect currents of the APD (in the range of 200 nA to 100 micro A). Could some one suggest me the best IC with less bias current, single supply (+5 V only) and how to design a high sensitive TIA..? (typically, for every 100 nA change in the current, 100 mV voltage should be displayed).


Design a transimpedance amplifier

Started by Anonymous in sci.electronics.design4 years ago 23 replies

Hello experts, well..am new to this field and I was given a task of designing a trans impedance amplifier to detect low currents of the APD...

Hello experts, well..am new to this field and I was given a task of designing a trans impedance amplifier to detect low currents of the APD ranging from 0 to 15uA.. It looks simple to go ahead but the design requirements threw plenty of challenges and brought me here.. Here are my design requirements: Photodoide: Avalanche Photo-diode with 5pF input capacitance and 50nA dark current, R=0....


Re: My Geomagnetic Amplifier Circuit

Started by Phil Allison in sci.electronics.design6 years ago 34 replies

Robert Stevens wrote: > This is a high gain instrumentation amplifier, based upon the Analog > Devices AMP01, I designed to detect low...

Robert Stevens wrote: > This is a high gain instrumentation amplifier, based upon the Analog > Devices AMP01, I designed to detect low intensity ELF's in real time > and amplify them to drive a small calibration coil. > > The signal input is from a large induction coil of the type used for > geomagnetic surveys. > > https://app.box.com/s/wd13qq8kfwoeibvunflw > > Can anyone see an


Transimpedance amplifier

Started by Fitzgerald in sci.electronics.design6 years ago 16 replies

Hi all, I have designed my first transimpedance amplifier and would love to get some feedback. Goal is to convert the current of a...

Hi all, I have designed my first transimpedance amplifier and would love to get some feedback. Goal is to convert the current of a photomultiplier to a voltage of -3V to +3V. Note that the current flows into the PMT. The ADR5043 is 3V shunt voltage reference to set the zero current output, followed by a low-pass filter (fc = 0.3 Hz) to filter noise. Schematic is shown here: http://i...


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 Sunday, May 17, 2015 at 5:16:19 AM UTC-7, Phil Hobbs wrote: > > Hey Phil...Just to clarify, you're suggesting a 2kohm resistor to gnd on all...

On Sunday, May 17, 2015 at 5:16:19 AM UTC-7, Phil Hobbs wrote: > > Hey Phil...Just to clarify, you're suggesting a 2kohm resistor to gnd on all c-multiplier > > outputs (3 of them: +/- 10V for the opamps and -10V for the PD), right? we'll try using a x10 > > scope probe for the non-inverting configuration. > > So, Felipe, did that fix it? > > > Cheers > > Phil Hobbs


manual for PAR 129 lock-in amplifier

Started by Anonymous in sci.electronics.design4 years ago

Hi, I was wondering if anyone had pdf of the PAR 129 lock-in amplifier manual. Can't seem to find it online. Kelly

Hi, I was wondering if anyone had pdf of the PAR 129 lock-in amplifier manual. Can't seem to find it online. Kelly