Description
WE ARE RICH ELECTRONICS
WE PURCHASE AND RECYCLE
SURPLUS ELECTRONIC
COMPONENTS AND EQUIPMENT!
For sale here we have the above…
5 Pieces
Aluminium electrolytic capacitor ideal for low voltage applications. Vintage style from the 1970’s – but being Philips products they don’t dry out like some inferior makes, if they do need reforming we give details below.
- Capacitor Type: Electrolytic
- Capacitance: 47uF (tolerance not indicated)
- Voltage: 10VDC
- Temperature Rating: Not Indicated
- Leads: Axial, 31mm each end
- Dimensions: 10 x 5.5 diameter
- Manufacturer: Philips Electronics
- Part Number / Marking: 015 S
- Specification: N/A
- Source: Inventory Surplus stock ‘Milspec’ company
These are genuine Philips vintage capacitors which due to their age may need reforming.
… the procedure described below is given to aid the engineer but…
Please be aware these are electrolytic capacitors and by their very nature require a high degree of skill when handling and installing, they are intended for use by qualified electronic engineers, please do not purchase and engage in any of these procedures if you are not competent to do so!
Reforming Electrolytic Capacitors
- Manufacturers claim that most old electrolytics can be saved if the correct procedure is followed, regardless of how long they have been unused. Such capacitors must be “reformed”. This process consists of applying rated voltage through a resistance (about 30,000 ohms, five watt) for five minutes plus one minute for each month of storage (see figure 6). As the capacitor reforms, the voltage across the resistor will drop (measured at the Xs in Figure 6). If that voltage will not drop below 10% of applied voltage after one hour, the capacitor is probably beyond help.
Reforming Electrolytic Capacitors – The process of reforming an old aluminum electrolytic capacitor consists of the application of rated voltage, through a resistor, for a period equal to five minutes plus one minute per month of storage.The electrolytics appearing on the surplus market have often been in storage for a very long period indeed. Some manufacturers use a visible code, of which the first two digits indicate the year of manufacture.The circuit shown in the sketch above works reasonably well. Apply the rated voltage through a 5W resistor. Anything from 20K-50K will do, as this is far from a precision process. The meter is used to measure the voltage drop across the resistor; when no current is flowing, there will be no drop. Obviously, when there is a large voltage drop (more than 20% of the applied voltage), there must be a significant current flow through the capacitor. The nature of a proper capacitor is to impede DC current flow, so when there is such flow, something must be wrong.Note: Apply the appropriate D.C. voltage to the capacitor with a D.C. power supply. An old Kepco, Lamba etc. tube regulated lab power supply rig works great. Be sure to observe the proper polarity! - For further info search… Reforming Electrolytic Capacitors
PLEASE NOTE!
These parts came to us as part of a lot of surplus stock from a large ‘Milspec ‘ type Co. and have been kept in storage for a time, they are however in good condition, stored with us still on their original paper tape packaging and boxed, the photographs are representative of their general condition, being of some of our actual stock, and, as with all our products they come with a full guarantee.
If you have similar items to this, or indeed any electronic components that are surplus to requirements please contact us with details.
