Interesting feature of an inexpensive function generator

Started by Charles in sci.electronics.design9 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?


Looking for SMD level shifters to TTL

Started by John Robertson in sci.electronics.design1 year ago 25 replies

Working on a FPGA project and we need perhaps 30 level shifter gates. Anyone work with 3.6 to 5.0 volt interfaces that can recommend any...

Working on a FPGA project and we need perhaps 30 level shifter gates. Anyone work with 3.6 to 5.0 volt interfaces that can recommend any single part over the rest before I spend a few hours digging through Digi/Mouser/Newark's inventory? In some cases we can get away with resistors, but there is a bit of TTL level drivers needed. Thanks! John :-#)# -- (Please post followups or...


Input protection for 3.3V FPGA in a TTL world...

Started by John Robertson in sci.electronics.design12 months ago 37 replies

I am still working with a friend on a TTL level replacement for some chips on a pinball board and we have a nice FPGA (MAX 10 based) but it...

I am still working with a friend on a TTL level replacement for some chips on a pinball board and we have a nice FPGA (MAX 10 based) but it wants (of course) 3.3V I/O. I was thinking that SN74CBT16211C (24 x IO level shifter) and a TVS arrays like the D3V3X8U9LP3810-7 with a low Ohm (1 - 10R) Flame-Proof 1/8W or less resistor on the outside world interface would do for protection. ...


Favorite jellybean ~HF BJT?

Started by Tim Williams in sci.electronics.design13 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...


Good Replacement for 4052 Analog Mux.

Started by Anonymous in sci.electronics.design8 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.design10 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...


LED reference current source

Started by John Larkin in sci.electronics.design10 years ago 286 replies

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...


complementary cmos levels

Started by Anonymous in sci.electronics.design3 years ago 11 replies

I have a fast 3.3 volt logic level that I'd like to split into inverted and non-inverted copies with minimum time skew. I think that TI...

I have a fast 3.3 volt logic level that I'd like to split into inverted and non-inverted copies with minimum time skew. I think that TI once had a buffer with one input and complementary outputs, but I can't find a reference to that. It's probably slow and obsolete. A TTL to RS485 converter sort of works but would be slow. I could use two separate XOR gates, one as a buffer and the...


the PDP-11 lives!

Started by John Larkin in sci.electronics.design9 years ago 36 replies

http://www.theregister.co.uk/2013/06/19/nuke_plants_to_keep_pdp11_until_2050/ -- John Larkin Highland Technology,...

http://www.theregister.co.uk/2013/06/19/nuke_plants_to_keep_pdp11_until_2050/ -- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME the...


Using Flash RAM to replace obsolete CMOS RAM

Started by John Robertson in sci.electronics.design1 year ago 30 replies

I have a project in mind using small Flash RAM and a cheap CPU to substitute for the old TTL level CMOS RAM used on arcade games. This has...

I have a project in mind using small Flash RAM and a cheap CPU to substitute for the old TTL level CMOS RAM used on arcade games. This has come up because the NVRAM that is currently being used is getting hard to find at prices under $7 to $9USD. Something like the M25P05-AVMN6P (512k or 64K x 8) or similar chips are $0.20 in single quantities. The size of CMOS RAM we are replacing ...


arduino pro mini vs Nano

Started by dcas...@krl.org in sci.electronics.design6 years ago 9 replies

Just some thoughts that may help someone. To get started I would recommend the Nano. You just need it , a usb cable, and the IDE downloaded....

Just some thoughts that may help someone. To get started I would recommend the Nano. You just need it , a usb cable, and the IDE downloaded. The Nano has a usb chip on the module. No hassles about connecting. The pro mini does not have a usb chip, but is otherwise the same. To use it you need a usb to TTL adapter. I bought an adapter with a FDTI232 chip and could not get


Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project

Started by Jan Panteltje in sci.electronics.design8 years ago 8 replies

Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project Got some ebay USB To RS232 TTL PL2303HX Auto Converter Module...

Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project Got some ebay USB To RS232 TTL PL2303HX Auto Converter Module Converter Adapter for arduino ebay object: 360750555245 Module has 5V and 3.3 V out (from the USB power). The PL2303 works 100% OK with Linux native drivers. Just connect to RS232 in and RS232 out, and power, and no need to write USB code, or get a sp...