Please note, these are also duplicated in the bipolar transistors listings. Mar 21, 2004 years ago there were books for transistor equivalents. A good ac128 may sound much better than a bad oc44. Uk vintage radio repair and restoration transistor. Select a replacement transistor with equivalent ft. The internal appearance of one these transistors is shown in figure 8. Lecture 24 mosfet basics understanding with no math. Universally useful and adaptable, the transistor is an essential component of electronic circuitry. Free transistor circuits books download ebooks online. Tube oc 45 or rohre oc45 id33673, transistor, wires and rfifstage shown. The period books often suggested the use of a small soldering iron of around 15 watts when soldering transistors. Many of,the circuits in thij book make use of the ocl69 and a chapter. Full text of mullard data book 196566 internet archive.
Oc45 transistors 30 in stock to buy, photo, pdf datasheet. The best equivalent transistors are the af12x series that are the same piece of. Any replacement transistor of the same type, whether used or newoldstock, will have. The purpose of this book is to help the reader to understand how transistors work and how to design a simple transistor circuit. Imo, the 2 transistor books i got need a good instructor to clarify basic concepts like flow of electrons and holes, reverse bias, forward bias, etc. Transistor equivalent book pdf free download by corfikome. Oc44 datasheet, equivalent, cross reference search. Transistor development continued, and the next family of devices, the af117 and equivalents, used a different manufacturing process that reduced the internal capacitance, eliminating the need for.
Transistor equivalents for the substitution of modern transistors in elderly projects. Download ic database equivalent guide 100 thousand components. Does anybody have any suggestions where i might get hold of some 2. Some of the transistors are types with integrated resistors. Semiconductor cross reference book engineers of howard w. Cross reference universal transistor reference page 1. There is no listed equivalent to the af118 and where replacement is needed for an old transistor tv, it may be necessary to rejig the circuit to take a suitably rated silicon device.
I recently got a book called the radio constructor in which are a lot of radiobuilding projects. Digital transistors dtr these are transistors with built in resistors. This looks like the ubiquitous to18 package as used by the bc108 and similar but with a forth lead for the screen. Download book 200 transistor circuits talking electronics. That is 1,000,000 when the transistor was announced by bell labs in 1948, two uk.
Alan doolittle lecture 24 mosfet basics understanding with no math reading. When the transistor was announced by bell labs in 1948, two uk companies. However the af239s is a uhf device designed for use in tv uhf tuners and has a low gain min hfe 10 compared with the af11x types min hfe 50 and my experience is that it wont work properly if at all in most radio circuits. Transistor equivalent circuits and models learning objectives general dc equivalent circuit ac equivalent circuit equivalent circuit of a cb amplifier effect of source resistance r s on voltage gain equivalent circuit of a ce amplifier equivalent circuit of a cc amplifier smallsignal lowfrequency model or representation. Transistor equivalents for the substitution of modern. Practical transistor receivers, book american radio history. A great book for learning electronics in easy plain language. Design and application of transistor switching circuits. Oc44 datasheet, cross reference, circuit and application notes in pdf format. Mullard soon switched to using the bc prefix for silicon, and ac for germanium, eliminating the confusion.
But the reliability and failure modes of vintage transistors is interesting, and is the subject of this article. Maximum power, called p d, is the overall power a transistor can dissipate, through heat, without burning up. Ics for cdcdrom player an8377n 3channel linear driver s overview the an8377n is an ic, g c. The external resistors set an operating bias on the base to the transistor and limit current from the ac signal. Add to cart international transistor equivalents guide 1.
Mullards first silicon transistors were the oc201 to oc207, pnp alloy types using the standard so2 metaloverglass construction such as the oc201 shown. The long black tubular one is also a replacement, an oc45. Tube oc 44 or rohre oc44 id33607, transistor, wires and frequency converter shown. For the pointcontact transistor a small slab of ntype germanium consisting of a single crystal and having a volume resistivity of 5. What books should one use to study mosfet, bjt transistor. Transistors are solidstate electronic devices used to control the flow of electricity in electronic equipment and consist of a semiconductor material with at least three electrodes for connection to a circuit. Consider the contents of this book as the first mile of a long journey into transistor. Applies to shipments to germany with our standard courier service dhl when paid via paypal, credit card or lastschrift.
In practice, the af125 can be used to replace af114115116. It is in the stud package used for the commercial oc16, the first mullard power transistor, which suggests that it dates from about 1956. This is where you will find all the transistors specifically in the oc series i. Transistor kit 10 value 200pcs npn pnp power transistor. Generalpurpose transistors used for radio frequency amplification were the following. The oc45 and equivalentsimilar devices from other manufacturers were the first types of transistor to have widespread use in if amplifiers. However, the replacement oc45 in my set had an orange spot, where it should have been blue. Dont go for a transistor with a much higher ft as this may increase the risk of oscillation.
I show it because my example is typical of many cv specimens in that it comes in a small paper envelope containing a paper label bearing the title valve electronic, the part number. Free transistor equivalent book transistor bipolar junction. Af121 datasheet, equivalent, cross reference search. This diagram shows the lead connections for the mullard transistors most often encountered in british transistor radios made in the 1960s viewed from underneath. Oc45 pnp germanium transistor in a classic so2 glass test tube. Data on many transistors is available on my valve data cdrom. Oc45 datasheet, equivalent, cross reference search. A to5 transistor with a p d of 3 watts might be able to dissipate 810 watts with a heat sink. This page contains list of freely available e books, online textbooks and tutorials in transistor circuits. Still, to me transistors are very technical i need a transistor book that is about 8th grade level with more diagrams. Delivery times for other countries and shipping methods can be found on our shipping information page. Oc44 transistor pnp oc45 transistor pnp oc71 transistor pnp two oc72 transistor which are a matched pair. Sn76477 2n4401 free transistor equivalent book semiconductor data handbook mj802 2n3866 s2p tis43 bc149c xr2206 application notes lm1 siemens transistor manual.
These can occasionally be found on ebay, usually advertised as germanium devices. Does anyone know where the site is that you type in a transistor and get a list of equivalent transistor. Free transistor circuits books download ebooks online textbooks. Circuit 10 is similar to circuit 9 except that the diode is. The transistors used in are oc45 and oc71s ive got hold of the 71s, but am having real trouble trying to find a source for the 45s. Common types include bjt transistors, rf transistors, darlington transistors, and mosfet transistors. Buy international transistor equivalents guide bernard babani publishing radio and electronics books by adrian michaels isbn. Apr 05, 2008 i during 80s and 90s, i used to search for components equivalents in books. There is nothing in the transistor data books about this.
Keep in mind that germanium transistors vary a good deal. Download ic database equivalent guide 100 thousand. Articles transistors in vintage radios marks pages home. This section contains free e books and guides on transistor circuits, some of the resources in this section can be viewed online and some of them can be downloaded. Mullard mullard mullard mullard mullard oc44m oc45 oc45m oc57 oc58 mullard mullard mullard. Of course, after 40 plus years of life, most electrolytic capacitors are suspect and the carboncomposition resistors have drifted high and sometimes become very noisy. One of the larger surfaces of this germanium slab is soldered on to a metal carrier and thus forms the base. However, since this book was written in 1963 i cant find any of the parts online. I have an extensive collection of original data sheets and books, and can. Heat sinks and fans increase the ability of a transistor to dissipate heat. In certain cases, the quoted collector current may be exceeded. I keep looking for equivalent transistors, and sometimes find a website that gives a list equivalent transistor.
Choosing transistor replacements electronics notes. Diodes and transistors pdf 28p this note covers the following topics. Af115, af116 these are not encapsulated black glass, but already philipsmullard to1 boxed. This suggests that this cxt6b may be a gpo type, probably equivalent to oc16. The best equivalent transistors are the af12x series that are the same piece of germanium, but mounted in a to72 case. Should you find any info that can fill in any of the blanks in the matrix below. Apr 17, 2017 although the software seems a bit ugly design running on dos, but it works perfectly with the database with many components and is free, makes an interesting tool to interested in electronics, want to know when information about a particular component or find a replacement. An9010 all mosfet equivalent book free all transistor equivalent book free transistor equivalent book power bjt advantages and disadvantages an9010 vmosfet bjt isolated base drive circuit drive base bjt fqp10n20 n power mosfet depletion. The cv7004 is a another lowpower germanium pnp switching transistor equivalent to the gec type get873, the mullard type oc45, and the stc types tk30c and asy54. International transistor equivalents guide bernard babani. Also in 1956, mullard announced the oc44 and oc45 transistors, the latter. It is necessary to ensure that the replacement transistor will be able to operate at the relevant frequencies, so a similar or slightly higher ft is advisable. Is there any webbased or stand alone program to do such service for transistors and ics.
About 7 to 10 thousand transistor bars can be cut from each ingot of germanium. High voltage 75v video amplifier for transistor tvs. Transistor semiconductor history texas instruments rca bell laboratories western electric general transistor fairchild tungsol sylvania mullard philips stc newmarket general electric philco gec motorola shockley faraday willoughby smith william adams richard day charles fritts braun schuster henry round jagadis bose greenleaf pickard alan wilson walter schottky boris davydov nevill mott. Since i would need to remove it anyway to fit it tidily, i decided to fit the correct type instead. The only information that i have unearthed is that the 1963 cv register of electronic valves mentions two gpo types, cxt1 and cxt2, with cv equivalents.
Jun 15, 2015 oc45 less high frequencies than previous ones, but very little leakage, therefore reliable and easy to bias, but lower gain. Vrt comparison table for semiconductors from a to z edition. Aug 25, 2011 crossreferences are not magic, understanding of the circuit and a parametric search of the important parameters is much more reliable. The following diagram and paragraph are taken from the book electronic classics. Uk vintage radio repair and restoration transistor radio. The idea was that the lower power would prevent that parts becoming too hot. Transistors continue to replace valves in their traditional applications and the next unilateralised circuit compared with 37 db. Any orders placed through this store will not be honored or fulfilled. Vintage mullard semiconductors andrew wylies watercolours pages. The secret to making these pedals sound good is biasing the transistor. The equivalents list may be removed from the main book if desired. The links at left may help you to research your own replacement transistors. Hi all, i realise this is a long shot but im trying to repair a circuit board that switches 12v soleniods, it does a lot more besides but i had a short on one soleniod which in turn burnt out what i assume to be a 0.
It is shown as a diode for the be pn junction and a current source for the ce junction. One of my interests is restoring vintage transistor radios. Sample pages of the vrt comparison books from eca edition 20102011 vrt volume 1 from a to z split into 2 books vrt1a and vrt1b 1496 pages isbn 9783937469379 vrt volume 2 from 0 to 680 pages isbn 9783937469386. Making a transistor radio parts list of course, if you had a time machine, you could visit the peter vis hardware mercantile store, and i will pack all of these items for you in a nice brown paper bag. It is addressed to amateur circuit designer with little or no previous knowledge on semiconductors. Same qualities in treble boosters and other preamps. If not, it can usually be obtained from transistor data books.
But all this is some ones idea of what a equivalent is. Basic semiconductor physics, diodes, the nonlinear diode model, load line analysis, large signal diode models, offset diode model, transistors, large signal bjt model, load line analysis, small signal model and transistor amplification. I highly recommend the geofex article on the rangemaster. The cv7003 is a lowpower germanium pnp switching transistor equivalent to the gec type get874, the mullard type oc44 and the stc types tk31c and asy55. The oc44 and oc45 used in early transistor sets tend to be reliable. The stac150v2350e is a high voltage nchannel mos fieldeffect rf power transistor especially designed for 150v industrial rf power class e generators such as pecvd plasma sputtering, flat panel and solar cells manufacturing equipments. So called equivalent parts, or nte replacements, may not work at all in some cases, because they were worse in some spec, or the circuit was designed with the assumptions that the part had a fairly low bandwidth. Everyday low prices and free delivery on eligible orders. Most have a way to say i need a transistor like this. Uk vintage radio repair and restoration transistor faults. Wherever you need to control the flow of electricity in a device from transistor radios, to diodes, to circuit boards you can find a great collection of transistors on ebay. Aug 21, 2014 general electric transistor manual if that link goes away, you can sometimes find it for absurd.
Check our section of free e books and guides on transistor circuits now. Any replacement transistor of the same type, whether used or newold stock, will have. Philips described its pointcontact transistors in general terms as follows. The ac128 sounds different but good in its own right. Switch at its most basic, a transistor is a switch. I found a bluespot oc45 with sufficiently long leads, and made the correct coloured sleeves for. Another point to watch is that equivalent books list the af239s as a replacement for the af11x range. This transistor has a low collector capacitance and has excellent gain up to several megacycles.
111 639 1287 1152 110 1271 1353 1271 1423 1021 629 928 465 169 173 975 398 387 26 1139 1021 93 673 23 1191 258 1213 1148 295 1323 572 979