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Hey everyone,
Is it possible to reduce transformer size while retaining output current capability (voltage is locked)?
If heat dissipation is not a problem, would decreasing primary inductance and increasing switching frequency (e.g. current controlled or voltage controlled) increase the...
Hey, here is the schematic. PR1 is the node I'm interested in time domain. I'm trying to create a basic equation for PR1's V(t), but feeling bit confused now.
Initial conditions for C1 is 60V and C2 is 5V.
Hey Everyone,
Imagine A circuit of C1 -> R1 -> C2
And C1 is also connected to R2 and then to GND,
Where C1 initial voltage is lets say 60V, and C2 initial voltage is 10V. C1=100µF, C2=5µF, R1 = 100Ohm, R2 = 500Ohm. How would one solve C2 voltage in respect of time? Any steady state equation...
Hello,
I'm making a low voltage step-up converter with inputs 0.2-0.4V. Output should fall 1.5-1.8V and higher the output current capability the better. I'm operating in CCM.
Okay, I have no problem starting it and achieving >80% efficiency at light loads (say 10mW). However when I want more...
Hi everyone,
I need to make a low current voltage reference with discrete components. I'm familiar with Zener based devices and TL431, but they are drawing too much quiescent current in order to have accurate regulation. My target is to be 10µA - 50µA (quiescent).
I have studied a bit of...
Greetings,
Can someone point out what are the methods to transmit simultaneously/asynchronously between many slaves or nodes to the host, by using only one conductor?
For example, in I2C, master uses address to select which slave can transmit data. Or SPI uses CS to select which slave to...
Try to google: transimpedance amplifier photodiode
You should see circuit schematics how to properly amplify a photodiode signal.
For the sunlight problem, are you familiar with high pass filter? Or AC coupling? Sunlight is basically a constant light or slowly changing light signal, right? So...
Hello,
I'm building an accurate current limiter with limited amount of potential difference in voltage supply. I'm using a N-channel MOSFET as driver and then having a NPN BJT to do feedback when current exceeds desired amount. Circuitry looks a bit like this: **broken link removed**
The...
Hello,
I have never seen any designs that would cascade a passive RC-filter before Sallen-Key filter. So can it be done? I don't see any reason why not if the signal is pre-amplified.
In the application, signal is a pulse of lets say 100µs followed by a 5s pause(=OFF). In application...
Keith, I guess I have to try some other manufacturers and models. I guess I'd have to try some low junction capacitance models.
FvM
1. thats correct, I meant actually the both. DC shift measured after transimpedance amplifier is approx. 200-500mV, depending on how the sunlight hits the...
Hi Keith,
I tried to connect anode pin to ground plane, however the result shift amplitude stayed the same. Although when I did connect anode pin to ground, I left positive input at 2.5V this means that photodiode becomes reverse biased which affects linearity and capacitance of photodiode. But...
Here is a description of op amp configuration. ADC is AD7980 (16bit) referenced to ground and clean 5V VDD rail. Photodiode outputs a square wave current signal which is converted to voltage, passed through to band pass.
When sunlight hits the photodiode I get increase in results. Maximum pk-pk...
Hello All,
I have a set-up which consists a photodiode(non biased set-up) -> transimpedance amplifier -> sallen-key band-pass filter -> anti-aliasing filter -> ADC -> digital lock-in amplifier. In analog amplifier section, I'm referencing all ground connections(except op-amp's VSS pin) to a...
Hello,
Thanks for your posts.
My current arrangement with ground planes is that SMPS is converting Power-Over-Ethernet power as isolated DC-DC. I have chassis ground which is connected to SMPS ground via 1.5kV 1nF capacitor. I would like to keep the isolated ground as separate from chassis...
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