Bjt should be in active or mos should in saturation at all times. The alloydiffused af114, af115, af116 and af117 transistors were introduced in the early 1960s. International transistor equivalents guide american radio history. Ac128 germanium transistor germanium transistors parts. Switching circuit, inverter, interface circuit, driver circuit built in bias resistor r110k, r247k complement to ksr2006 absolute maximum ratings ta25c unless otherwise noted symbol vcbo vceo vebo pc tj tstg parameter collectorbase voltage collectoremitter voltage emitterbase voltage collector current. 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. Tube ac 128 or rohre ac128 id33948, transistor, wires and poweroutput shown. Gains on what ive checked so far are between 60160. The basic converters complete equivalent circuits can be studied here which include the basic ac modeling approach and the results for several converters. C5885 datasheet vcbo1500v, npn transistor panasonic, pdf, pinout, equivalent, replacement, schematic, manual, data, circuit, parts, datasheet. Transistors are nonlinear devices but all circuit analysis is premised on the circuit elements being linear so this causes. Omni rarani press the publishing division of babani trading and finance co limited the grampians shepherds bush road. We will construct the nonlinear model and convert it into a linear circuit that describes the smallsignal performance of a circuit. The region that lies between these two is the linear region.
My philips ac125s are higher gain if thats what you need. A transistor equivalent circuit is usually a linear approximation that simplifies circuit analysis of transistor circuit. Replacing all capacitors by a shortcircuit equivalent 3. Savantic semiconductor product specification silicon pnp power transistors bd176 bd178 bd180. This is further substantiated by a hungarian data book 7. There is an af118, but this is not found in transistor radios its a high voltage transistor intended for use in video circuits, but it is occasionally found elsewhere for example, the leak stereo 30 hifi amplifier. Ao4609 complementary enhancement mode field effect transistor the ao4609 uses advanced trench technology mosfets to provide excellent rdson and low gate charge. Pnp germanium alloy transistor for af low power amplifier applications. Liven up your fuzz face, pimp your fuzz factory, wrangle your rangemaster. Valve tube and transistor with informationprojects and technical help. The ec10 used an allgermanium pnp transistor lineup that shared many circuit design elements.
A simple circuit diagram is used for highfrequency converters. Ac128 germanium transistors transistorsics lowleakage pnp germaniums perfect for all your fuzzy desires. They are a direct substitute for oc81d and work great in fuzz pedals. Ac125 germanium small signal transistors components datasheet pdf data sheet free from datasheet data sheet search for integrated.
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. These are similar to oc44n and sft308 and have very low leakage. Fully tested with a peak atlas dc55 and sorted for gain, compensating for leakage. If a mica insulation is used, the thermal resistance of the mica washer must be added, which amounts to about 0. Im looking at buying transistors and noticed its extremely difficult to find ac 128 transistors, as noted on the fuzz factory schematic. Im working on a guitar pedal that calls for a ac128 germanium pnp transistor and i was wondering why i might not want to just get a modern equivalent. Should you find any info that can fill in any of the blanks in the matrix below. Transistor equivalents guide by adrian michaels bernard babani publishing ltd the grampians. The transistors are from a sealed bag from the 1970s and are gain matched and checked for proper leakage with a peak atlas dc55. Information source collector info sammler ktt 196970, tvt 1979 eca. Vcbo1500v, npn transistor datasheet search and pdf download.
When analyzing a transistor circuit, different responses are produced by the transistor circuit depending on the frequency of the ac signals being input into the circuit. Setting all dc sources to zero and replacing them by a shortcircuit equivalent 2. A transistor acts as a good amplifier in this linear region. A site for the novice or established collectorrestorer of vintage radio sets and electronics. Any orders placed through this store will not be honored or fulfilled. Ac128 datasheet germanium small signal transistors. Uk 240320 we have decided not to take any more orders at the moment. In this case, before fitting a replacement transistor, check the associated bias components, coupling. Transistor equivalents for the substitution of modern. Tungsram made other transistors equivalent to oc types, presumably starting. Considering now the proelectron numbering, here is a tungsram ac125 in. The transistors are from a sealed bag from the 1970s and are gain matched and checked for proper leakage with a peak atlas dc55 transistor tester, and checked in circuit in one of my test pedals. Gain range is 60, so they are right in the fuzz face range.
Ac125 datasheet germanium small signal transistors. Simpson page 227 writes an equivalent formula for the gain using the transistor parameter b and a slightly different temperature, t 3000k. Ac128 germanium transistor pnp hfe 100 build your own. Jun 03, 2016 c5885 datasheet vcbo1500v, npn transistor panasonic, pdf, pinout, equivalent, replacement, schematic, manual, data, circuit, parts, datasheet. Offering a matched set of three ac125 germanium pnp transistors for tone bender mkiimarshall supa fuzz. Ac125 datasheet, ac125 pdf, ac125 data sheet, ac125 manual, ac125 pdf, ac125. Experiment 6 transistors as amplifiers and switches. High voltage 75v video amplifier for transistor tvs.
Original transistor type original alternative type modern substitute alternative substitute. Ac125 germanium pnp transistors matched set for a tonebender. If this load line is drawn only when dc biasing is given to the transistor, but no input signal is. Directions for determining the thermal resistance rths for cooling fins can be found on page 11.
Ic cross reference cross reference ci stk cross reference ci tda cross reference ci sharp cross reference hitachi audio ic cross reference and circuit applications smd cross reference and equivalent we make every effort to ensure that the material on this site is accurate, however we do not warrant or represent that the information is free. Ac equivalent model of bjt amplifier topics covered. 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. In terms of the hybrid parameter model we will see this model soon rbe hie hfe using rbe to design a circuit is a dangerous practice as it depends on temperature and varies. Just a work of caution, many of the transistor equivalent documents and software packages have shortcomings and i am afraid to say that in many cases they have proved to be wrong. Ac125 transistors 90 in stock to buy, photo, pdf datasheet.
Germanium pnp transistors, manufactured by toshiba ac128 transistors are a popular choice for fuzz and overdrive pedals. Tube ac 125 or rohre ac125 id33949, transistor, wires and audio frequency shown. Toshiba transistor silicon pnp epitaxial type pct process. The links at left may help you to research your own replacement transistors.
Toshiba transistor silicon pnp epitaxial type pct process 2sa10 color tv verttical deflection output applications power switching applications high voltage. Pdf 74ac125 ac125 equivalent components of diode ac125 equivalent transistor ac125 74ac125 74ac125b 74ac125m diode equivalent ac125. The load line is drawn by joining the saturation and cut off points. World transistor equivalents data az by eca author 4. It seems stock of these is rapidly dwindling worldwide. See all formats and editions hide other formats and editions. Selected ac125 pnp germanium transistor, hfe8090 leakage smaller than 300ua. Text in other languages may differ dimensions whd incl.
C1815 cross reference electronic circuits, tv schematics. Crossreferences are not magic, understanding of the circuit and a parametric search of the important parameters is much more reliable. Is there any equivalent transistor i can use in place of this one, something that is easiercheaper to get a hold of. Since the distribution of heat in the transistor crystal is not uniform and depends on voltage and. Ac125 datasheet, equivalent, cross reference search. As discussed before, the voltage a circuit receives from a source depends on its input impedance as well as the internal impedance of the source, while the voltage it delivers depends on its output impedance as well as the load impedance. Experiment 6 transistors as amplifiers and switches our final topic of the term is an introduction to the transistor as a discrete circuit element. It is therefore important to consider these input and output impedances of an amplification circuit as well as its voltage gain. The apidictor was designed in the early 1950s and contained three types of transistor, each of which could be of two specified types, but none of these are in general supply as of the early 2000s. Since an integrated circuit is constructed primarily from dozens to even millions of transistors formed from a single, thin silicon crystal, it might be interesting and instructive to. Aug 08, 2011 the very old ac128 germanium transistor had a different baseemitter voltage requirement compared to a silicon transistor and had a poor high frequency response so it will sound different to a silicon transistor. Cross reference universal transistor reference page 1. Ac125 datasheet, ac125 pdf, ac125 data sheet, ac125 manual, ac125 pdf, ac125, datenblatt, electronics ac125, alldatasheet, free, datasheet, datasheets, data sheet. The complementary mosfets may be used to form a level shifted high side switch, and for a host of other applications.