Transistor-Transistor TTL Logic and Totem pole output

Started by Patrick Chung in sci.electronics.design2 years ago 7 replies

By combining basic TTL Logic NAND gate with invertors and other gate any logical function can be realized in TTL technology. TTL family of logic...

By combining basic TTL Logic NAND gate with invertors and other gate any logical function can be realized in TTL technology. TTL family of logic circuits is specially empowered with TTL Totem pole output Read more: http://www.cirvirlab.com/index.php/electronic/181-transistor-transistor-ttl-logic.html


Testing a TTL chip

Started by Anonymous in sci.electronics.design9 years ago 11 replies

I am trying to figure out if a TTL chip of mine (for my science fair - see "Vacuum Tube Calculator Schematic" for more) to see if I burned...

I am trying to figure out if a TTL chip of mine (for my science fair - see "Vacuum Tube Calculator Schematic" for more) to see if I burned it out. It's a 7474, and I've connected the ~PRESET inputs directly to +5V because I do not want to be setting it (only reseting it). Did I do something wrong? I know that I can do that in CMOS.


TTL signal

Started by Anonymous in sci.electronics.design9 years ago 30 replies
TTL

I'm trying to convert an analog signal, 150mV, 3-5nS pulse width to a TTL signal.

I'm trying to convert an analog signal, 150mV, 3-5nS pulse width to a TTL signal.


Interesting feature of an inexpensive function generator

Started by Charles in sci.electronics.design4 years ago 15 replies

Hi, I have been using an GW Instek SFG-2110 and find that the TTL output has a fast rise time. It is about 2 ns and this could be useful for...

Hi, I have been using an GW Instek SFG-2110 and find that the TTL output has a fast rise time. It is about 2 ns and this could be useful for oscilloscope bandwidth measurements for instruments of less than 100 MHz. The TTL option seems to be missing on more expensive function generators. Any thoughts?


Attacking the 35$ (not) computah

Started by Jan Panteltje in sci.electronics.design6 years ago 211 replies

Attacking the 35$ (not) computah. "To get people interested in computers and electronics" Then why not release the datasheet of the chips? A...

Attacking the 35$ (not) computah. "To get people interested in computers and electronics" Then why not release the datasheet of the chips? A circuit diagram, full documentation too. So that is a joke. Sinclair came with the ZX80 in the eighties. It was all TTL chips, and a Z80 processor. Now that was something. The ZX81 had some of that TTL integrated. Diagrams were available, I ev...


3 phase motor driver

Started by GregS in sci.electronics.design9 years ago 2 replies

I have been fishing through drivers hoping to find something. Anyone know of a 3 phase mosfet driver module with TTL in and the old board used a...

I have been fishing through drivers hoping to find something. Anyone know of a 3 phase mosfet driver module with TTL in and the old board used a 170 VDC supply or rectified 120 line. probably less than 10 amps. I have seen pieces, but looking for an integrated module. The control circuitry is intact in the device. Seems like the thing opperates around 20 kHz. Must be isolated from TTL in. I ...


LVTTL to RS-232 adaptor

Started by Anonymous in sci.electronics.design9 years ago 10 replies

Hello, I am looking for a LVTTL to RS-232 adaptor. I found a similar adaptor http://www.hvwtech.com/products_view.asp?ProductID=289 But...

Hello, I am looking for a LVTTL to RS-232 adaptor. I found a similar adaptor http://www.hvwtech.com/products_view.asp?ProductID=289 But this adoptor does TTL to RS-232. Since I plan to convert the LVTTL output from a Virtex-4 FPGA to RS-232 signal, I need LVTTL to RS-232 adaptor. Virtex-4 FPGA many I/O standards including LVTTL, LVCMOS,...but not TTL. Would appreciate your support....


Yikes!

Started by John Larkin in sci.electronics.design6 years ago 77 replies
TTL

I found myself still using my yellow "The TTL Data Book for Design Engineers", second edition, from 1976. John

I found myself still using my yellow "The TTL Data Book for Design Engineers", second edition, from 1976. John


looking for a transistor

Started by Anonymous in sci.electronics.design10 years ago 93 replies

I need to switch some GE #44 lamps from a TTL output. #44 lamps are 6.3 volts at 250 ma, so I'll need a transistor to do the real work....

I need to switch some GE #44 lamps from a TTL output. #44 lamps are 6.3 volts at 250 ma, so I'll need a transistor to do the real work. Unfortunately, it's just a hair too much power for one of the hundreds of surplus 2n2222's I keep around to do almost everything else here. Can someone suggest a small, cheap available transistor that would be appropriate for this use? -- Lee K. Gleason N...


Digital Logic IC family

Started by Mark in sci.electronics.design6 years ago 7 replies

How to findout from the datasheet or any other parameter of the digital ICs (MCUs, Logic ICs, CODECs etc) whether a particlar IC belongs to...

How to findout from the datasheet or any other parameter of the digital ICs (MCUs, Logic ICs, CODECs etc) whether a particlar IC belongs to CMOS or TTL or LVCMOS or LVTTL family? Thanks -Mark


SPDIF to TTL

Started by Dirk Bruere at NeoPax in sci.electronics.design7 years ago 8 replies
TTL

There are a number of circuits on the Net to do this. For example: http://sound.westhost.com/project85.htm In Fig 5 should that IC be a 74HC04...

There are a number of circuits on the Net to do this. For example: http://sound.westhost.com/project85.htm In Fig 5 should that IC be a 74HC04 as stated, or 74HCU04? -- Dirk http://www.transcendence.me.uk/ - Transcendence UK http://www.blogtalkradio.com/onetribe - Occult Talk Show


Favorite jellybean ~HF BJT?

Started by Tim Williams in sci.electronics.design8 years ago 13 replies

2N2369 is an old standby... kind of high current (200mA), like a '3904 sped up about 2-3 times. Not well specified though, I suppose because...

2N2369 is an old standby... kind of high current (200mA), like a '3904 sped up about 2-3 times. Not well specified though, I suppose because it's so old. I'm thinking in the 20V, 50mA range, fT maybe 0.5-1GHz. Like if you wanted to make old school RTL circuits that run as fast as 74S TTL. MPSH11 looks good, and '81 looks like its complement. I've used PN3563 before (complement PN425...


How to double PCI clock?

Started by Johann Klammer in sci.electronics.design2 years ago 9 replies

Classical 5V PCI, that is. Is there a small IC for this? I need a 66 Mhz clock generated from the 33Mhz of the PCI bus, but can not seem to...

Classical 5V PCI, that is. Is there a small IC for this? I need a 66 Mhz clock generated from the 33Mhz of the PCI bus, but can not seem to find an IC that is specified for the PCI input spikes of 11V. Also, most seem to be cmos parts that have the input thresholds at vcc/2 instead of the lower TTL levels.


Good Replacement for 4052 Analog Mux.

Started by Anonymous in sci.electronics.design3 years ago 7 replies
TTL

Looking for a cost effective part that is better then the classic 4052 switch. Requirements: Rugged part that can handle being used by...

Looking for a cost effective part that is better then the classic 4052 switch. Requirements: Rugged part that can handle being used by hobbyists. Dip package preferred for customer replacement. +/- 12 to 15V rails. TTL Control +/- 5V signal, DC to 3 KHz waveforms. Steve


pc motherboard grounds

Started by John Larkin in sci.electronics.design5 years ago 115 replies

The mounting holes on PC motherboards: are they usually connected to the PCB ground plane? -- John Larkin ...

The mounting holes on PC motherboards: are they usually connected to the PCB ground plane? -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL d...


Bucket List

Started by John Larkin in sci.electronics.design4 years ago 3 replies

43. PRESIDENT OF EGYPT OK, I'm thinking about striking that one off. -- John Larkin Highland Technology...

43. PRESIDENT OF EGYPT OK, I'm thinking about striking that one off. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME an...


High Speed Driver?

Started by Vladimir Vassilevsky in sci.electronics.design9 years ago 4 replies
TTL

I need to generate the accurate waveform from TTL input. The swing should be ~20Vpp, slew rate > 1kV/us, load current ~5mA, top and bottom...

I need to generate the accurate waveform from TTL input. The swing should be ~20Vpp, slew rate > 1kV/us, load current ~5mA, top and bottom tied to the reference voltage. The switch like that can certainly be done with few discrete components, however I wonder if there is a single IC solution. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com


Xenon flash tube

Started by bitrex in sci.electronics.design2 years ago 42 replies

I got several of these xenon flash tubes down at Rat Shack on sale for less than 2 bucks...

I got several of these xenon flash tubes down at Rat Shack on sale for less than 2 bucks each. http://www.radioshack.com/long-life-xenon-strobe-tube/2721145.html Anyone have a design for a junk box circuit that could be used for experimenting with these, say firing them from a TTL logic output?


555 timer

Started by George Herold in sci.electronics.design6 years ago 41 replies

Hey, I think I=92ve got a use for a few dual 555 timers. (First time in ~20 years) I want to make some signal sources with a max freq. of maybe...

Hey, I think I=92ve got a use for a few dual 555 timers. (First time in ~20 years) I want to make some signal sources with a max freq. of maybe 100kHz. (I figure I=92ll heavily RC filter the output) I was going to order the CMOS version (TS556). Is there any reason to use the TTL one? (NE556) The minuscule cost difference makes no difference to me. Thanks, George H.


hurricanes

Started by John Larkin in sci.electronics.design4 years ago 51 replies

http://stevengoddard.files.wordpress.com/2013/05/screenhunter_19-may-08-06-04.jpg -- John Larkin Highland...

http://stevengoddard.files.wordpress.com/2013/05/screenhunter_19-may-08-06-04.jpg -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links ...