redesign germanium transistor circuits

Redesign Germanium Transistor Circuits, Part 1

Redesign Germanium Transistor Circuits, Part 1; Today... Build Germanium Transistor Projects with Silicon Transistors! Return with us now to the halcyon days of germanium! Germanium transistor projects intrigued experimenters from the early days in the 1950s until the early 1970s. In the Seventies, the higher-grade silicon devices began to take over the hobby market. Hobbyists adapted, by ...

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Redesign Germanium Transistor Circuits, Part 3

Redesign Germanium Transistor Circuits, Part 3; Necessary Circuit Changes. Germanium-to-silicon conversion. Left: Original circuit from Chapter 4. Middle: Silicon, fixed-bias version. Right: Silicon, self-bias version (much stabler). The drawings also show how to convert from PNP to NPN transistors: Reverse all polarized parts. Advantages or Problems? Our part substitutions should properly ...

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Redesign Germanium Transistor Circuits, Part 2

Redesign Germanium Transistor Circuits, Part 2; Conversion Examples. Bias Network, Etc. Below are several examples of the conversion process. I've analyzed a famous germanium project book and come up with substitutions for base bias resistors and other parts. The silicon replacements require twice the base bias voltage of germanium parts. (Silicon transistors turn on at 0.7 vs. 0.3 volt for ...

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Redesign Germanium Transistor Circuits, Part 7 ...

Redesign Germanium Transistor Circuits, Part 7; Replacement Transistors, Capacitors, Diodes Universal Replacement Parts. Fortunately, replacing germanium devices with silicon ones isn't entirely guesswork. When the industry switched over in the 1960s and 1970s, it provided excellent replacement parts. At the time, these parts had average performance characteristics that would suffice in many ...

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Redesign Germanium Transistor Circuits, Part 5: Project ...

Redesign Germanium Transistor Circuits, Part 5; Project Vendor Links. World Radio History. Complete scans of the great electronic hobby magazines. Also trades, tech books, parts catalogs. You can search on a magazine or a magazine topic at Google or Duckduckgo. Then find the article. The top page is an index of thousands of magazine titles, including cover thumbnails. Kudos to David ...

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Germanium Transistor Amplifier Circuit - Electronics ...

Electronics Projects, Germanium Transistor Amplifier Circuit " audio amplifier circuits, transistor amplifier, " Date 2016/04/22. Once AD161-AD162 I had an experiment with pair. I still use almost every day. At first I didn’t like the sound, but I like listening to. The frequency of particular speech sounds very clear and is understandable. Quite a while (probably has been for eighteen years ...

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Vintage Radio and Electronics. Germanium Transistors

For the Radio Constructor we have an archive of Vintage Circuits (schematics) to build ... GERMANIUM TRANSISTORS The following table lists the parameters for Germanium transistors. The column marked Case is the outline of the transistor case. Note: Not all headings are the same parameter. The case drawings are shown at the bottom of the page. Cases GEC MAZDA STC AEI HIVAC

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Build this 8 Transistor Stereo Amplifier

The original circuit design for the Stereo Amplifier from Radio Shack used 8 germanium transistors arranged in three stages: Differential Amplifier, CE Driver, and Push-Pull Output. These stages were common in high-end commercial amplifier design so the 8 Transistor Stereo Amplifier project should have earned a lot of fans back then. However, after only 3 years the kit was withdrawn which ...

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germanium transistor redesign - animalfarmbb.co

Circuit Card s History Univac Guys I think that the germanium transistors were on the 250XXXX cards as used in the 1206 computer era and the 700XXXX cards all used silicon transistors and were used on the 1212 and later Jack mentions a complete redesign between the 642A and 642B Also probably the card use . Inquiry-> Redesign Germanium Transistor Circuits Part 1. Jan 03 2012 I am looking for ...

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It's Raining Germanium! - tonefiend

13/08/2013  A germanium transistor that tests over 250 for hfe on a regular tester like on a cheap DMM is certainly leaky, and will sound crappy in any distortion circuit, especially the FF. The gain number isn’t that important, most Ges test around 100 (unless they are leaky). In my experience almost all Tungsram AC125s are unuseable (they go off the scale, ie, over 1000 on my very good quality beta ...

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Redesign Germanium Transistor Circuits

Redesign Germanium Transistor Circuits; Redesign Germanium Transistor Circuits. We are here for your questions anytime 24/7, welcome your consultation. Get Price. Junction transistor type 2n35 ri ca 50 ppfd.Ceramic capacitors spin subminiature tube socket c6 005 st make friends with transistors.T this series of easy -to -assemble projects is designed to demonstrate basic applica-tions at ...

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Bones Hi - Fi: Germanium Transistor Based Audio Power ...

10/05/2013  The inherently widely varying parameters in germanium transistors means resistor values selected for AC / DC biasing, Q-point operation, feedback and stability that works for one circuit may not necessarily work in another similarly designed circuit even though both use germanium transistors from the same batch. This means resistor values must be “tweaked” – i.e. slightly varied higher ...

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Transistor Germanium Vs Silicon

Redesign Germanium Transistor Circuits Part 3. Bd677a S Npn Epitaxial Silicon Transistor Samsung . Silicon transistors are superior to germanium in almost every way. Transistor germanium vs silicon. Germanium vs silicon fuzz beforeafter wah history and more. Starting from the beginning in 1948 the original commercial transistors were made from germanium material unlike all the silicon ...

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Push-Pull Amplifier Circuit - Class A, B AB Amplifier ...

It consists of two transistors in which one is NPN and the other is PNP. One transistor pushes the output on positive half cycle and other pulls on the negative half cycle, hence the name push-pull amplifier. The main advantage of this transistor circuit is that there is no power dissipation at the output transistor, when there is no signal.

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Germanium Power Amplifier

(This was a problem with the germanium transistor models I was using, they had Vbe like for silicon ones, but I didn't yet know how to change this.) Getting Somewhere Typically, it turned out to be much, much simpler in practice. I thought the 220Ω bias resistors a mite 'OTT' in terms of low value, so had opted for 470Ω. And as it turns out, the transformers I've got have 3.5 DCR on the ...

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Articles › Transistors in Vintage Radios

Germanium transistors. The earliest practical transistors were made from germanium, and devices using this material were commonly used well into the 1970s. It's true that silicon transistors are better in most regards, but used appropriately, germanium transistors can give excellent results, and generally, they are remarkably reliable - especially when you consider how young the semiconductor ...

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Vintage Mullard Semiconductors - Wylie

Mullard also produced switching transistors for use in computers and logic circuits. In 1959 they announced a number of these, including the OC41 and OC42 in the SO-2 metal can, and the rather unusual OC139 to OC141 which are germanium NPN types in the SO-2 glass package, usually marked "MADE IN HOLLAND". All of these devices found widespread use in the UK electronics industry,

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Build this 8 Transistor Stereo Amplifier

The original circuit design for the Stereo Amplifier from Radio Shack used 8 germanium transistors arranged in three stages: Differential Amplifier, CE Driver, and Push-Pull Output. These stages were common in high-end commercial amplifier design so the 8 Transistor Stereo Amplifier project should have earned a lot of fans back then. However, after only 3 years the kit was withdrawn which ...

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How to Build a Germanium Diode Circuit

In this circuit, we will show how to build a germanium diode circuit, but more importantly how it compares with a silicon diode. Diodes, of course, are components that allow current flow in one direction but not the other. Diodes, like transistors, are semiconductor devices that are doped in such a way that they allow flow in one way but not the other. They are used often in circuits for many ...

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It's Raining Germanium! - tonefiend

13/08/2013  A germanium transistor that tests over 250 for hfe on a regular tester like on a cheap DMM is certainly leaky, and will sound crappy in any distortion circuit, especially the FF. The gain number isn’t that important, most Ges test around 100 (unless they are leaky). In my experience almost all Tungsram AC125s are unuseable (they go off the scale, ie, over 1000 on my very good quality beta ...

More

Transistor Germanium Vs Silicon

Redesign Germanium Transistor Circuits Part 3. Bd677a S Npn Epitaxial Silicon Transistor Samsung . Silicon transistors are superior to germanium in almost every way. Transistor germanium vs silicon. Germanium vs silicon fuzz beforeafter wah history and more. Starting from the beginning in 1948 the original commercial transistors were made from germanium material unlike all the silicon ...

More

Bones Hi - Fi: Germanium Transistor Based Audio Power ...

10/05/2013  The inherently widely varying parameters in germanium transistors means resistor values selected for AC / DC biasing, Q-point operation, feedback and stability that works for one circuit may not necessarily work in another similarly designed circuit even though both use germanium transistors from the same batch. This means resistor values must be “tweaked” – i.e. slightly varied higher ...

More

Push-Pull Amplifier Circuit - Class A, B AB Amplifier ...

It consists of two transistors in which one is NPN and the other is PNP. One transistor pushes the output on positive half cycle and other pulls on the negative half cycle, hence the name push-pull amplifier. The main advantage of this transistor circuit is that there is no power dissipation at the output transistor, when there is no signal.

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Biasing That Transistor: The Common Emitter Amplifier ...

04/05/2018  The classic transistor amplifier circuit then has a pair of resistors in series between supply and ground, forming a potential divider that gives the base its bias. The emitter is grounded, and ...

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Sola Sound Bum fuzz with NPN OC139 Germanium

25/05/2019  I just tried this from a hunch while I barely understand electric circuits. Bum fuzz was made after BM fuzz. it came from Tonebender Jumbo, and Jumbo came from Big muff. and they are not far from Tonebender MK3. it means this pedal would work with Germanium transistors. Sola Sound make 3 different versions of Bum Fuzz units with BC184, BC549C, and ZTX109. BC184 and ZTX109

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Transistor Common Emitter Circuit Design - lectronics

The circuit design shows the transistor with an input resistor and a collector resistor. The input resistor is used to limit the current flowing into the base, and the collector resistor is used to develop that voltage at the output. When a logic high is seen at the input this causes current to flow through R1 and into the base. This causes the transistor to switch on. In turn the voltage on ...

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Transistor Circuit Handbook for the Hobbyist: 30 Useful ...

TRANSISTOR CIRCUIT FOR THE HOBBYIST . SYLVANIA LITHO U S.A. At last! a handbook that helps you learn transistor circuitry while building useful equipment at a sav- ing—Features circuits for instrumentation, high fre- quency, audio, entertain- ment and household aids. Title: Transistor Circuit Handbook for the Hobbyist: 30 Useful Battery-Powered Transistor Circuits Author: Sylvania

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Build this 8 Transistor Stereo Amplifier

The original circuit design for the Stereo Amplifier from Radio Shack used 8 germanium transistors arranged in three stages: Differential Amplifier, CE Driver, and Push-Pull Output. These stages were common in high-end commercial amplifier design so the 8 Transistor Stereo Amplifier project should have earned a lot of fans back then. However, after only 3 years the kit was withdrawn which ...

More

How to Build a Germanium Diode Circuit

In this circuit, we will show how to build a germanium diode circuit, but more importantly how it compares with a silicon diode. Diodes, of course, are components that allow current flow in one direction but not the other. Diodes, like transistors, are semiconductor devices that are doped in such a way that they allow flow in one way but not the other. They are used often in circuits for many ...

More

3W Audio Amplifier Using AC187-AC188 Pair -

Circuit Diagram of 3W Audio Amplifier Using AC187-AC188 Pair. A discrete 3W Audio power amplifier circuit is shown in figure 1 employs a complementary output stage featuring the AC 187-AC188 (T 3 and T 4) germanium output transistor pairs. This amplifier can deliver a maximum of 3W into an 8Ω loads. Input sensitive for rated output is 50mV. Transistor T 1 T 2 work as common emitters with T ...

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ElectroSmash - Fuzz Face Analysis

Germanium Transistor Selection: ... There are some circuits that help to measure the transistor gain. 2. The Fuzz Face Circuit. The circuit is a simple 2 stage amplifier with a feedback network path. It can be broken down into three parts: Input Stage, Output Stage and Feedback Network. The last block (the Feedback Network) will affect the rest of the analysis because it will influence the ...

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Push-Pull Amplifier Circuit - Class A, B AB Amplifier ...

It consists of two transistors in which one is NPN and the other is PNP. One transistor pushes the output on positive half cycle and other pulls on the negative half cycle, hence the name push-pull amplifier. The main advantage of this transistor circuit is that there is no power dissipation at the output transistor, when there is no signal.

More

Bones Hi - Fi: Germanium Transistor Based Audio Power ...

10/05/2013  The inherently widely varying parameters in germanium transistors means resistor values selected for AC / DC biasing, Q-point operation, feedback and stability that works for one circuit may not necessarily work in another similarly designed circuit even though both use germanium transistors from the same batch. This means resistor values must be “tweaked” – i.e. slightly varied higher ...

More

Biasing That Transistor: The Common Emitter Amplifier ...

04/05/2018  The classic transistor amplifier circuit then has a pair of resistors in series between supply and ground, forming a potential divider that gives the base its bias. The emitter is grounded, and ...

More

Transistor Germanium Vs Silicon

Redesign Germanium Transistor Circuits Part 3. Bd677a S Npn Epitaxial Silicon Transistor Samsung . Silicon transistors are superior to germanium in almost every way. Transistor germanium vs silicon. Germanium vs silicon fuzz beforeafter wah history and more. Starting from the beginning in 1948 the original commercial transistors were made from germanium material unlike all the silicon ...

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ac128 germanium pnp transistor All About Circuits

21/03/2015  I'm 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. Thanks . Like Reply. Scroll to continue with content #12. Joined Nov 30, 2010 18,210. Aug 8, 2011 #2 It depends on the circuit. Germanium has slightly different characteristics from silicon. If you post the circuit, people here will be able to ...

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Transistor Circuit Handbook for the Hobbyist: 30 Useful ...

TRANSISTOR CIRCUIT FOR THE HOBBYIST . SYLVANIA LITHO U S.A. At last! a handbook that helps you learn transistor circuitry while building useful equipment at a sav- ing—Features circuits for instrumentation, high fre- quency, audio, entertain- ment and household aids. Title: Transistor Circuit Handbook for the Hobbyist: 30 Useful Battery-Powered Transistor Circuits Author: Sylvania

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