All Questions
Tagged with ttl microcontroller
25
questions
3
votes
4
answers
13k
views
Turn TTL output of logic IC into output capable of driving 50 ohm devices
I want to provide front-panel trigger signals with the microcontroller inside my device. The trigger signal will be fed via a 50 ohm coax cable to another device with a 50 ohm input.
A direct ...
- 653
0
votes
2
answers
1k
views
Minimizing voltage drop across SSR when using it to pull down a TTL digital input on another device?
I have a situation that I've run into a few times. I have a digital output card in my system that uses SSRs. I'm trying to interface to a device (referred to as my DUT from here on) that has TTL ...
- 63
1
vote
3
answers
2k
views
Interfacing VC0706 with AVR Microcontroller
I am having trouble interfacing a VC0706 Camera with only an AVR Microcontroller. I am using simple serial communication but the camera does not respond. I tried connecting it with a computer but ...
- 11
0
votes
3
answers
751
views
Solid-state Electronic switch for low level signals
I need a very simple circuit to connect a signal to one of two ways like this:
My com signal is actually a microphone input, so very low voltage, <200mV, how can I make a solid state switch that ...
- 507
2
votes
3
answers
1k
views
How do I safely connect a 74HC00 series circuit to microcontroller?
I built and simulated a circuit out of 74HC00 series ICs and want to connect it to a microcontroller (ATmega 16).
The development board I use (Atmel STK500) supplies 4.93 V (GND to VTG and GND to ...
user29239
0
votes
1
answer
7k
views
Difference between TTL I/O type vs Schmitt trigger I/O type
While reading microcontroller data sheet i came across i/o types like
i) TTL
ii) schmitt trigger.
I came to know that TTL i/o logic means 0v-0.8v -logic state 0, 2-Vcc means logic state 1 (as ...
- 271
5
votes
3
answers
2k
views
Driving LEDs / other small loads with a 74HC06 or similar inverter
I was recently reverse-engineering some firmware (and other bits) from a router, and spotted that the front panel LEDs were driven from a 74HC06 hex inverter gate chip rather than a proper LED driver.
...
- 10.8k
5
votes
1
answer
3k
views
how to interface HCPL-3700 optocoupler to an input pin of ATmega16L
I want to detect logic of the mains supply (230VAC, 50Hz) and feed the output of HCPL-3700 into ATmega16L. I read through the datasheet but could not understand how to calculate the resistor values. ...
- 1,495
5
votes
1
answer
671
views
Dual power supply confusing TTL serial?
Sorry for the vague title: I'm a bit of a noob at analogue electronics, more a logic &software guy. Basic problem is I'm sitting at the end of a cable with a USB powered Arduino trying to send ...
- 51
17
votes
2
answers
49k
views
How does TTL serial work?
I've been trying to find a good description of the TTL serial "standard" without much luck. I understand that serial transmit (TX) and receive (RX) lines idle high (at VCC) and that they drop to ...
- 2,564