What is the value of this capacitor? - UK Vintage Radio Repair and Restoration Discussion Forum

Francis · 16th Jan 2017, 8:06 pm

Hello, everyone,

Can someone tell me what this capacitor reads and what the symbol next to the four stands for? I've added a close-up image of the symbol.

Thank you.

TonyDuell · 16th Jan 2017, 9:36 pm

My first question is 'are you sure it is a capacitor?' It could be a metal oxide varistor (used to supress overvoltage spikes, the '275' might be the voltage) or even a thermistor (used to limit the inrush current in a switch-mode power supply.

What is it out of? Are the any markings on the PCB where it was fitted?

Sideband · 16th Jan 2017, 9:41 pm

....and the mark after the 4 could well be a trademark. Likewise I think it either a varister or thermistor....favourite being the former rather than the latter.

turretslug · 16th Jan 2017, 9:52 pm

-594- was part of a Philips designation for a widely-used MOV series, it looks as though (squiggle) is whoever that bit of Philips components was acquired by.

I've a clutch of -594- 275V types with Philips yellow epoxy coating, they get used (with safeguarding fusing) in stuff here.

MOVs turn up in a lot of devices, unfortunately as has been mentioned, they look like ceramic capacitors (in a way, they are a ceramic capacitor, but one that has been characterised for its breakdown behaviour, rather than capacitance- which will show a few hundred pF).

Francis · 16th Jan 2017, 11:40 pm

Hello, everybody,

Thank you all for your very interesting answers. The component comes from a control module, which is from a Hoover Electron 800 washing machine. The component in particular is in between the two terminals pictured. As you can see, there are no markings on the board.

Thanks again.

Boater Sam · 17th Jan 2017, 2:04 am

Its a varistor, spike suppression for the motor brushes. Designed to breakdown at a voltage over 275v AC to protect the module components.

ukcol · 17th Jan 2017, 12:01 pm

From

http://www.datasheetarchive.com

Andrew B · 17th Jan 2017, 2:00 pm

Discrete components, this must be an old machine!! What are the numbers on the IC ?

I presume the aluminium cover doubles as a heatsink for an SCR.
Keep us informed please.

Herald1360 · 17th Jan 2017, 7:17 pm

TCA1370?

TCA prefixes seem to relate to motor control chips of one sort or another.

McMurdo · 17th Jan 2017, 7:30 pm

that's an epcos logo, (formerly Siemens & Halske). I agree its a 275V AC MOV and if it isn't split apart it'll be ok.

Francis · 17th Jan 2017, 10:24 pm

Thank you, Boater Sam. I believe you're spot on with that answer.

Thank you, Colin. That is very helpful.

The machine dates around 1979-80, Andrew M6HNU. The IC numbers (and letter) are TDA1070P and yes, the aluminium cover acts like a heatsink for an SCR.

Hello, Herald1360. It's a TDA1070P.

Thank you, Kevin. That's great information.

Maarten · 19th Jan 2017, 12:44 am

Quote:

Originally Posted by Francis

Thank you all for your very interesting answers. The component comes from a control module, which is from a Hoover Electron 800 washing machine. The component in particular is in between the two terminals pictured. As you can see, there are no markings on the board.

Most of the components on that board were made by Philips, so it seems very likely this is indeed a Philips part. Almost certainly a 594 series varistor (VDR as Philips called them).

Could it be a Philips-assembled module by any chance? Any 12 digit markings on it, possibly starting with 4213?

Maarten · 19th Jan 2017, 12:46 am

Quote:

Originally Posted by McMurdo

that's an epcos logo, (formerly Siemens & Halske).

Indeed, however the machine predates Epcos by roughly 2 decades so that's an interesting observation. Probably has been replaced before then.

Andrew B · 19th Jan 2017, 1:11 am

I can't find a datasheet for the TDA1070 anywhere.

'LIVEWIRE?' · 21st Jan 2017, 12:07 pm

Are you sure the IC is a TDA1070? IIRC that was an AM RF/IF chip used, amongst other things, in many Blaupunkt car radios in the 80s.

Herald1360 · 21st Jan 2017, 3:46 pm

The not too clear photo looks more like TCA than TDA.

It might be a proprietary part number.

Andrew B · 21st Jan 2017, 5:02 pm

Herald1360, the OP assures us it's a TDA 1070P

Francis · 21st Jan 2017, 8:30 pm

Hopefully, this close-up image will help answer some of your questions.

Andrew B · 22nd Jan 2017, 12:51 am

Question is................where are the data sheets for it? The interweb-thing draws a blank on it.

Herald1360 · 22nd Jan 2017, 1:37 am

If it's a proprietary device or just a standard part with an in house number, data would have to have leaked out from Hoover or their control pcb subcon for it to be around on the web.

If the pcb can be reverse engineered or a circuit found, the pinout may line up with some standard motor control chip.

16th Jan 2017, 8:06 pm	#1
Francis Triode Join Date: Jan 2017 Location: Glasgow, Scotland, UK. Posts: 33	What is the value of this capacitor? Hello, everyone, Can someone tell me what this capacitor reads and what the symbol next to the four stands for? I've added a close-up image of the symbol. Thank you. Attached Thumbnails

16th Jan 2017, 9:36 pm	#2
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: What is the value of this capacitor? My first question is 'are you sure it is a capacitor?' It could be a metal oxide varistor (used to supress overvoltage spikes, the '275' might be the voltage) or even a thermistor (used to limit the inrush current in a switch-mode power supply. What is it out of? Are the any markings on the PCB where it was fitted?

16th Jan 2017, 9:41 pm	#3
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,572	Re: What is the value of this capacitor? ....and the mark after the 4 could well be a trademark. Likewise I think it either a varister or thermistor....favourite being the former rather than the latter. __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman.....

16th Jan 2017, 9:52 pm	#4
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,396	Re: What is the value of this capacitor? -594- was part of a Philips designation for a widely-used MOV series, it looks as though (squiggle) is whoever that bit of Philips components was acquired by. I've a clutch of -594- 275V types with Philips yellow epoxy coating, they get used (with safeguarding fusing) in stuff here. MOVs turn up in a lot of devices, unfortunately as has been mentioned, they look like ceramic capacitors (in a way, they are a ceramic capacitor, but one that has been characterised for its breakdown behaviour, rather than capacitance- which will show a few hundred pF). Last edited by turretslug; 16th Jan 2017 at 10:18 pm.

16th Jan 2017, 11:40 pm	#5
Francis Triode Join Date: Jan 2017 Location: Glasgow, Scotland, UK. Posts: 33	Re: What is the value of this capacitor? Hello, everybody, Thank you all for your very interesting answers. The component comes from a control module, which is from a Hoover Electron 800 washing machine. The component in particular is in between the two terminals pictured. As you can see, there are no markings on the board. Thanks again. Attached Thumbnails

17th Jan 2017, 2:04 am	#6
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	Re: What is the value of this capacitor? Its a varistor, spike suppression for the motor brushes. Designed to breakdown at a voltage over 275v AC to protect the module components.

17th Jan 2017, 2:00 pm	#8
Andrew B Heptode Join Date: May 2015 Location: Bradford, West Yorkshire, UK. Posts: 512	Re: What is the value of this capacitor? Discrete components, this must be an old machine!! What are the numbers on the IC ? I presume the aluminium cover doubles as a heatsink for an SCR. Keep us informed please. __________________ worried about the electrons entering the circuit and the smoke leaving Andrew

17th Jan 2017, 7:17 pm	#9
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: What is the value of this capacitor? TCA1370? TCA prefixes seem to relate to motor control chips of one sort or another. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

17th Jan 2017, 7:30 pm	#10
McMurdo Dekatron Join Date: Jun 2009 Location: Staffordshire Moorlands, UK. Posts: 5,271	Re: What is the value of this capacitor? that's an epcos logo, (formerly Siemens & Halske). I agree its a 275V AC MOV and if it isn't split apart it'll be ok. __________________ Kevin

17th Jan 2017, 10:24 pm	#11
Francis Triode Join Date: Jan 2017 Location: Glasgow, Scotland, UK. Posts: 33	Re: What is the value of this capacitor? Thank you, Boater Sam. I believe you're spot on with that answer. Thank you, Colin. That is very helpful. The machine dates around 1979-80, Andrew M6HNU. The IC numbers (and letter) are TDA1070P and yes, the aluminium cover acts like a heatsink for an SCR. Hello, Herald1360. It's a TDA1070P. Thank you, Kevin. That's great information.

19th Jan 2017, 1:11 am	#14
Andrew B Heptode Join Date: May 2015 Location: Bradford, West Yorkshire, UK. Posts: 512	Re: What is the value of this capacitor? I can't find a datasheet for the TDA1070 anywhere. __________________ worried about the electrons entering the circuit and the smoke leaving Andrew

21st Jan 2017, 12:07 pm	#15
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: What is the value of this capacitor? Are you sure the IC is a TDA1070? IIRC that was an AM RF/IF chip used, amongst other things, in many Blaupunkt car radios in the 80s.

21st Jan 2017, 3:46 pm	#16
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: What is the value of this capacitor? The not too clear photo looks more like TCA than TDA. It might be a proprietary part number. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

21st Jan 2017, 5:02 pm	#17
Andrew B Heptode Join Date: May 2015 Location: Bradford, West Yorkshire, UK. Posts: 512	Re: What is the value of this capacitor? Herald1360, the OP assures us it's a TDA 1070P __________________ worried about the electrons entering the circuit and the smoke leaving Andrew

21st Jan 2017, 8:30 pm	#18
Francis Triode Join Date: Jan 2017 Location: Glasgow, Scotland, UK. Posts: 33	Re: What is the value of this capacitor? Hopefully, this close-up image will help answer some of your questions. Attached Thumbnails

22nd Jan 2017, 12:51 am	#19
Andrew B Heptode Join Date: May 2015 Location: Bradford, West Yorkshire, UK. Posts: 512	Re: What is the value of this capacitor? Question is................where are the data sheets for it? The interweb-thing draws a blank on it. __________________ worried about the electrons entering the circuit and the smoke leaving Andrew

22nd Jan 2017, 1:37 am	#20
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: What is the value of this capacitor? If it's a proprietary device or just a standard part with an in house number, data would have to have leaked out from Hoover or their control pcb subcon for it to be around on the web. If the pcb can be reverse engineered or a circuit found, the pinout may line up with some standard motor control chip. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O