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TTL (Transistor
Transistor Logic) Circuits
Last Updated on:
Monday, April 16, 2012 07:46 AM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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AC Switching with TRIAC From TTL - The MC3032 is an optoisolator
TRIAC driver. The 180-ohm resistor sets the current for the LED emitter in
the optoisolator. Change the value of this resistor, if necessary, to get
reasonable current ASCII format (e.g., 15 mA). Note that you
cannot test this circuit without a load. The TRIAC will not switch unless
connected to an AC voltage source, so you can't test it for simple switching
w/o applying AC and a load. Note the 500V ating on the .01 cap. (ASCII
format circuit added 6/06) |
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Circuit Converts between TTL & Shifted Ecl - 08/15/96 EDN-Design
Ideas....The bidirectional circuit in Figure 1 translates TTL to shifted ECL
(SECL]. There are currently no IC's available that perform this type of
level translation. SECL levels correspond to either ECL or PECL referenced
to a VCC of 2V and a VEE of -2.5V. You frequently encounter these levels in
situations where the outputs of the ECL logic terminate.... [Design Idea by
Sylvia Planer and Paul Sofianos, Motorola LICD, Chandler, AZ] |
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Control 120 Volt AC Relay with TTL - ASCII format (circuit / schematic
design added 6/06) |
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LB-48: Linear Brief 48 Simple Voltmeter Monitors TTL Supplies - National
Semiconductor Application Note....[App Note] |
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Measure humidity and temperature on one TTL line - 30-Aug-01 Issue of EDN
By combining the responses of an Analog Devices (www.analog.com] AD590 temperature
sensor and a Humirel (www.humirel.com] HS1101 humidity sensor, you can generate a
single TTL-level signal containing information from both sensors (Figure 1).
This design uses a 74HC123 monostable multivibrator, IC1, to form a free-running
oscillator.... [Design Idea by Shyam Tiwari, Sensors Technology Pvt Ltd, Gwalior,
India] |
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Micro Spy with TTL - This circuit is old (70's) but since the 74LS13 is from
the regular 74xx series and easy to obtain, I decided to keep the circuit in place
until components are no longer available. Not much to tell here. Performance is
based on the 74LS13, a 'Dual 4-input Positive-Nand Schmitt Trigger'. This
circuit was experimental and so has no real purpose other than tinkering…. [written by
Tony van Roon] |
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RS-232 to TTL Cable - (circuit / schematic design added 6/06) |
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Simple Voltmeter Monitors TTL Supplies - National Semiconductor Application
Note....[App Note] |
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Trigger a TTL circuit from ECL levels - 8-Nov-01 Issue of EDN ECL
circuits typically have relatively small logic spans of approximately 800 mV. Because
of the small span, to drive TTL circuits from ECL levels normally entails the use of
level converters, such as the MC10125, or comparators. Such circuits are relatively
power-hungry and expensive. However, they are sometimes simply unnecessary.... [Design
Idea by Lukasz Sliwczynski, University of Mining and Metallurgy, Krakow, Poland] |
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TTL Pulse Reading Logic Probe - This circuit uses LEDs to display logic
states for high, low, rising pulse, and falling pulse, it is generally useful for
debugging logic circuitry…. [G. Forrest Cook] |
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Voltmeter Monitors TTL Supplies - National Semiconductor Application
Note....[App Note] |
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TTL (Transistor Transistor Logic) Circuits
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