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[Gopher]

Good evening all, sorting a few drawers came across these and I have no idea what they are used for, can anyone help?

[Plastic - RIP]

2sC2500 = transistor for firing flash strobes

TDA7052 = 1W mono amplifier

last thing - can't see it properly

[Gopher]

many thanks, I will try and get a better photo of the last item, the 1st 2 will go back in the drawer I don't think I will ever use them

[nivapilot]

Third one looks like it/they might be the sort of small cable crimps that the GPO used to use on their systems.

[Gopher]

is this a better picture

[Gopher]

just cracked one open they are a connector for thin wires, I may be able to use these

[malcolmfrary]

Almost as Nivapilot said, IDC crimps for wires of small diameter, although by the time that they came into use, the GPO had long lost any interest in phone lines.  They were stuffed with silicone grease to help keep damp away from the join.  Sort of, a mini Scotchlock.  They needed parallel action pliers to work as intended, but ordinary ones could work.

[Gopher]

Many thanks for that, I did notice some grease inside, I am having thoughts about trying to wire one of the strobe transistors up just for fun so I will need some help with what I will need to do it

[malcolmfrary]

The datasheet - http://html.alldatasheet.com/html-pdf/30107/TOSHIBA/2SC2500/246/1/2SC2500.html - indicates a nice medium power NPN transistor, should be good for a wide range of applications on low-ish voltage and moderate current.  The strobing will be a function of whatever is controlling it, not the transistor itself.

[Plastic - RIP]

The datasheet - http://html.alldatasheet.com/html-pdf/30107/TOSHIBA/2SC2500/246/1/2SC2500.html - indicates a nice medium power NPN transistor, should be good for a wide range of applications on low-ish voltage and moderate current.  The strobing will be a function of whatever is controlling it, not the transistor itself.

Dunno why anybody uses discrete transistors these days - you're always going to need more components around them so whatever you're building, there's probably a chip that does the job all in one box.

[nivapilot]

Here is a small amplifier circuit using the TDA7052.......now all you need is a suitable sound input.....hey presto.....sound module.

http://www.eleccircuit.com/super-small-amp-12w-by-ic-tda7052/

[canabus]

Hi All

Mal is right they are scotch locks used in the telephone industry including Australia.

[malcolmfrary]

Dunno why anybody uses discrete transistors these days - you're always going to need more components around them so whatever you're building, there's probably a chip that does the job all in one box.

Chips tend to be picky about the voltages that they will interface with - there are still lots of applications where a chip is cheaply available to do the clever bits but a transistor or something similar is needed to interface with external power.

[Plastic - RIP]

Chips tend to be picky about the voltages that they will interface with - there are still lots of applications where a chip is cheaply available to do the clever bits but a transistor or something similar is needed to interface with external power.

Totally agree - the need for special transistors - but an average, boring, middle-of-the-road single transistor is pretty much pointless these days.

[Arthur_C]

H
Last one is connector used by th post office to connect telehone wires. put wires in hoelos in pess close with a plier.