SS 8050 transistor high current equivalent - UK Vintage Radio Repair and Restoration Discussion Forum

IanNVJ35 · 31st Jul 2022, 10:12 pm

I'm having a go at repairing one of those electrical fly swatters. I attempted to get a wasp with it but that was the final nail in the coffin and the switching transistor failed. The unit draws around. 0.35 Amps at 3 V dc so looking at the datasheet the original transistor is a bit on the weak side. Is there something with a bit more 'beef' that has similar characteristics? If not its no problem to order up an exact replacement.

Many thanks for any info.

Diabolical Artificer · 2nd Aug 2022, 7:22 am

Pretty sure I've seen these used in florescent bulbs a lot.. you could try a BD139 but it depends at what frequency your circuit is working at, a NTE295 might do,but they're not easy to get hold of in the UK.
Both have a different pinout to the ss8550 so the base lead might need insulating and bending over.

Andy.

IanNVJ35 · 3rd Aug 2022, 10:47 am

Quote:

Originally Posted by Diabolical Artificer

Pretty sure I've seen these used in florescent bulbs a lot.. you could try a BD139 but it depends at what frequency your circuit is working at, a NTE295 might do,but they're not easy to get hold of in the UK.
Both have a different pinout to the ss8550 so the base lead might need insulating and bending over.

Andy.

Thanks Andy. Worth a try. At a guess its about 7 kHz max from the whistle.

Goldie99 · 3rd Aug 2022, 11:18 am

I had an extra 'S8050' supplied recently with a couple of speaker protection kits, I think the S8050 & SS8050 are the same (?). If so, and if it's any use to you, just pm me your details.

Alan

31st Jul 2022, 10:12 pm	#1
IanNVJ35 Heptode Join Date: Mar 2010 Location: Hemel Hempstead, Hertfordshire, UK. Posts: 847	SS 8050 transistor high current equivalent I'm having a go at repairing one of those electrical fly swatters. I attempted to get a wasp with it but that was the final nail in the coffin and the switching transistor failed. The unit draws around. 0.35 Amps at 3 V dc so looking at the datasheet the original transistor is a bit on the weak side. Is there something with a bit more 'beef' that has similar characteristics? If not its no problem to order up an exact replacement. Many thanks for any info.

2nd Aug 2022, 7:22 am	#2
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,662	Re: SS 8050 transistor high current equivalent Pretty sure I've seen these used in florescent bulbs a lot.. you could try a BD139 but it depends at what frequency your circuit is working at, a NTE295 might do,but they're not easy to get hold of in the UK. Both have a different pinout to the ss8550 so the base lead might need insulating and bending over. Andy. __________________ Curiosity hasn't killed this cat...so far.

3rd Aug 2022, 11:18 am	#4
Goldie99 Heptode Join Date: Jul 2014 Location: Boston, Lincolnshire, UK. Posts: 995	Re: SS 8050 transistor high current equivalent I had an extra 'S8050' supplied recently with a couple of speaker protection kits, I think the S8050 & SS8050 are the same (?). If so, and if it's any use to you, just pm me your details. Alan