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

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. "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...

I am looking for a way to take the TTL level outputs (treating them as inputs) of a 7448 and convert them back to the original BCD TTL input...

I am looking for a way to take the TTL level outputs (treating them as inputs) of a 7448 and convert them back to the original BCD TTL input levels (but as outputs) and I figured a simple socketed GAL would do the trick for the least cost. However I don't have the skill set to build the GAL logic table for this. Any suggestions? And no, I can't simply remove the 7448 from the circuit. ...

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....

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

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...

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...

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.

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

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...

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...

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?

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.

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 ...

Google that! -- John Larkin, President Highland Technology, Inc jlarkin at highlandtechnology dot...

Google that! -- John Larkin, President Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation

I need to convert LV (3.3v rail) signals to TTL levels (5V rail). My present arrangement is to feed the LV to 74HC04 inputs, with a 5v supply on...

I need to convert LV (3.3v rail) signals to TTL levels (5V rail). My present arrangement is to feed the LV to 74HC04 inputs, with a 5v supply on the 74HC04. That looks like it should be OK from the device datasheet, but I've experienced one runaway, the chip got smoking hot. Could this be caused by the fact that the inputs are not getting close enough to the rail voltage when they're hig...

http://www.theregister.co.uk/2012/07/16/nif_passes_500_trillion_watts/ -- John Larkin Highland Technology...

http://www.theregister.co.uk/2012/07/16/nif_passes_500_trillion_watts/ -- 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 analog, t...

Hi all I have a 6-input device, which will be connected to a PLC with 24V outputs. My circuit uses 74HC and one 74LS, so I need to convert...

Hi all I have a 6-input device, which will be connected to a PLC with 24V outputs. My circuit uses 74HC and one 74LS, so I need to convert my inputs to 5V. My device will consume 40mA at max. Are there any special (and cheap) devices for this? Or are optocouplers the best? Then again a 10Kohm and 39 Kohm can do it, with e.g a diode for protection. WBR sonnich

Has anybody done this? https://dl.dropbox.com/u/53724080/Circuits/Isrc_LED.JPG -- John Larkin Highland Technology...

Has anybody done this? https://dl.dropbox.com/u/53724080/Circuits/Isrc_LED.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 V...