8/19/2023 0 Comments Oc71 transistorFrom base to emitter, or base to collector. A small capacitor would make a faster transistor slow enough. I think the circuit posted above depends on the transistor being very slow, so you would want to use one of the audio transistors. In response, Mullard then changed their production process so that the OC71’s had a opaque silicone encapsulation of the die as opposed to translucent to protect their “new found” market for photo transistors. Go for the lowest cost PNP audio parts you can find. Engineers,not being entirely stupid caught onto this and just scraped the black paint off an OC71 to make an OCP71 equivalent and save 10 shillings. Details Item Number OC71 Item Condition New Price £12.50 (inc VAT £15.00) Options Quantity Add to Cart Next product PNP Germanium TO1 Black Glass 20V 10mA. Somewhere down the line, it was realised that photo-transistors could actually be a useful device, so Mullard introduced the OCP71 photo transistor ( bit of a clue in the naming convention here ) which as far as everyone could make out was an OC71 transistor but without the black paint and priced at a premium 17 shillings and six pence, over twice the price. Use the OC71 transistor.' Someone else said, 'Oh yes and. The device was light sensitive, so to stop the photo-transistor effect the glass enclosure was spray painted with black paint. It was called build your own transistor radio with a plank of wood.' I said, 'I remember that book. The OC71 devices were manufactured in a glass enclosure with the die protected by a filling of transparent silicone inside for mechanical protection. OC71 Mullard Germanium Transistors Unprinted NOS Tested & Selected. In these days, transistors were shipped individually ( at least in small quantities ) in long thin cardboard packages which in these days not only had the part number printed on the carton but the resale price as well ( 7 shillings and 6 pence in pre decimal currency for an OC71 if memory serves me correctly ). At that time, Mullard was popular as an original supplier of germanium transistors in the UK with the classic OC71 transistor. Money Back Guarantee ensures YOU receive the item you. Ah – germanium transistors, that takes me back. Shop the Largest Selection, Click to See Search eBay faster with PicClick.
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