Eeyore wrote:

dw wrote:

I would like to build a NiCa zapper and am looking for replacements,
subsitutions for BC131, BC182, BC212.

The zapper is at http://www.atv-projects.com/NiCad_Zapper.html if
anyone would like to take a look and give any comments.

BC182 and 212 are old TO-92 general purpose npn and pnp devices. BC547 and
BC557 are more modern equivalents.

BD131 ( npn 15W datasheet rating 45V ) is rarely seen now as it's an odd
package. One of the TIP power range e.g. TIP 29 (40V 30W) would probably
fit in that location although the package is different. Watch the pinout
and get it the right way round. Data for all these can be googled.

Actually it's a BD132 (pnp), so you'd need a TIP30.

Graham