1. A

    FT232RL Chip is not working (USB to TTL)

    First of all this is an urgent question my project's deadline is coming closer. Please help me I used FT232RL chip to make USB to TTL converter. I did this connection below. I can make serial communication but I cannot receive any message. I can also send message and TX Led is lightining up.
  2. justaskingonce

    7447 does not show correct numbers on 7 segment dispaly

    Im trying to put a bcd input into a 7 segement display, but as it only shows the numbers 4 to 8 correctly, in all other numbers all of the segments are on, does anyone knows why? you can see the binary input on the right video...
  3. P

    NAND gate TTL - How it works

    Hello, I am studying digital electronics and I am a bit confused about the saturation conditions of the bjt. I knew that the bjt saturates when the Vce is close to 0 and Vbe >= 0.7. However, when I was reading about TTL I got confused. Can someone give me some intuition and explain me why in the...
  4. T

    Is there a TTL-to-RS232 Level Shifter that allows me to select the output either TTL or RS232

    Hi everyone, I am looking for a TTL-to-selectable-TTL-or-RS232 level converter IC. Essentially, my host outputs UART TTL, but the UART client can expect either TTL or RS-232. I cannot find a TTL-to-RS232 level shifter that has an enable pin allowing me to select the output is TTL or RS232...
  5. S

    Photodiode with TTL output

    Hello, I am hoping that someone will be able to direct me towards the appropriate piece of hardware to purchase. I am a cognitive neuroscientist, hoping to stimulate a specific area of the brain using Transcranial Magnetic Stimulation. The onset of stimulation needs to be precise (~100ms) and...
  6. R

    Circuit Works on Breadboard But Not PCB

    Hello all! I've been trying to send and receive a signal by using TOSLink optical transmitters and receivers from Sys-Concept in the same circuit (making a transceiver of sorts): http://www.sys-concept.com/toslink_receiver.htm According to the data sheets of both the receiver and the...
  7. LordOfThunder

    Convert digital signal from TTL 5V to Raspberry Pi GPIO 3.3V

    Hello! I am a Ph.D. student in particle physics and for our experiment we need to convert a 5V TTL digital signal (16-bits actually) coming out of a Phillips 726 converter and read it using the GPIO pins of a Raspberry Pi 4. We do not need bidirectional communication. We just need to read this...
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