Peer-to-peer, engineer-to-engineer questions and answers from the EDABoard.com engineering community around analog ICs and analog design. Click the “Read more” link and follow the entire conversation and maybe add your two cents by logging in to EDAboard.com.
Scheme for multiple solid state relays controlled by MCU – I need to control multiple AC mains power terminals which are going to power DC power supplies. The aim of the control is just to switch OFF or ON the power for the DC power supplies when needed(not a nonstop ON OFF). So basically the idea is cut their electricity by a microcontroller board such as Arduino board’s digital outputs. Total number can be around six but for simplicity, I drew a diagram for three. Read more
Transmitter for short distance (10cm) – What would you recommend for a distance of 10cm more or less? Which transmitter system should I use? I need to make a connection between 2 objects in this distance (very low rate data). Read more
Modbus communication circuit – I am trying to communicate Modbus communication with PIC16F886/PIC18F24k40/PIC16F1938.I tested my code with MAX482 and SN75176A non-isolated version of the IC and it is working fine. Now I am testing same code with DE controlled using ADM 2483. A non-isolated version could not able to communicate. Is there any proven circuit or IC where it has been tested with above controller in an isolated version? Read more
Analog fast peak detector – I would like to build an analog fast peak detector. The signal to measure is PPM – 10ns pulses with 250ns repetition (4MHz), amplitude from 10mV to 5V. How circuit I can use to resolve this problem? Read more
Can this scheme be used to control multiple solenoids? – I need to control eight solenoid-valves for water drainage outdoors remotely and simultaneously. The valves are normally closed (NC) type which I guess in that context means they open and let the water drain only when they receive ON signal at their input. Read more
32.76 kHz Colpitts oscillator circuit – I’m trying to construct a Colpitts oscillator circuit for 32.76 kHz. But after soldering, the circuit is not working. The only thing I get at the output is 5V (measuring with an oscilloscope). Read more
Data and clock synchronization using 74HC4046 PLL – I am using HDB3 decoder IC for HDB3 to TTL/NRZL convertor for synchronization I need to use 74HC4046 PLL IC. The input frequency is 2.048MHz and the output should be the same 2.048MHz. Can anyone help me in this regard to select R1, R2 and C1 and the rest of the components value related to VCO input? Read more
Converting 150,000hz 3.3V 19.38mA DC to 20 V .2A AC – I already tried a Half Bridge and Full Bridge Rectifier, but the 3MHz N channel MOSFETs I bought, were not fast enough for some reason. All the ICs that I’ve found for the 150kHz range, top out at .1 A output for some reason. Read more
Noise calculation using HSpice – How many types of noise can we calculate using HSpice? I am focussing on CMOS inverter circuit. I have pre and post (with RC components) circuit file, a testbench, and model file. The noise data is getting published in the output LIS file and I am not able to figure out actual noise calculated as there are so many things getting dumped in LIS output file. Read more
What are these two circuits? – It looks like some sort of current mirrors but I am trying to understand what it is and what the merits/drawbacks of it. Has anyone seen this before? Read more
