SL100... again

[fantasymick]

I have searched the forum for this and observed the following...

Datasheet:
**broken link removed**

and from
https://www.electro-tech-online.com/threads/3pdt-off-on-on-is-this-made.1224/

that a replacement could include the: 2SD313, BD139 or BC301

I'm just a high school student who is interested in making the "Automatic Room Light" for an end-of-year project from:

Description:
http://www.electronic-circuits-diagrams.com/lightsimages/lightsckt4.shtml
Circuit Diagram:
**broken link removed**

(Where the *** is electronic circuits diagrams joined by a -)
(Somehow it's not showing...)

I cannot make use of the datasheet and is having a hard time finding the SL100 transistor.

Two locations that are close to me to buy electronic parts are:

http://www.abra-electronics.com/
http://www.sayal.com/

Both of which do not sell the SL100, 2SD313, BD139 or BC301. I would really appreciate it if the experts here can help me find a replacement that is available from the above two sites and works for the "Automatic Room Lights" project.

Many thanks.

 

[kinjalgp]

What load is connected to your transistor?
If it is used for driving a relay, then BC547/BC548 will also work without any problems.

 

[lavenatti]

The SL100 is a high frequency transistor, this isn't needed to drive a relay. Looks to me like any general purpose NPN will work. (2N3904, 2N2222 etc.)

 

[mechie]

Big Project

There is certainly plenty of circuitry to get your teeth into here ...

Yep, any old small or medium power NPN transistor should work.

I can't help thinking there is a *much* simpler circuit to achieve the same results, maybe based around an up/down counter thus eliminating one of the 4017s and all that 'compare' logic after it.

 

[fantasymick]

Thx to all the advice. I was able to find a replacement from:

https://www.nteinc.com/

The site has a search engine that especially looks for part replacements. I went out and bought a BD137 and NTE152. Hopefully one of them will work. From the responses, it looks as though they will.

In regards to a simpler design, it's way out of my league. Anyways, it looks more sophisticated this way, maybe I'll get a high mark for it

Thx again to all replies.