Transformerless class ab push-pull amplifier
A push pull amplifier is an amplifier which has an output stage that can drive a current in either direction through through the load. The output stage of a typical push pull amplifier consists of of two identical BJTs or MOSFETs one sourcing current through the load while the other one sinking the current from the load. Push pull amplifiers are superior over single ended amplifiers using a single transistor at the output for driving the load in terms of distortion and performance. A single ended amplifier, how well it may be designed will surely introduce some distortion due to the non linearity of its dynamic transfer characteristics. Push pull amplifiers are commonly used in situations where low distortion, high efficiency and high output power are required. Generally this splitting is done using an input coupling transformer.
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- Service of Consumer / Commercial Electronics--Analog amplifiers
- US3399354A - Transformerless push-pull transistor amplifier with feedback - Google Patents
- Analog Electronics Lab
- Push pull amplifier
- Engineering:Push–pull output
- Lecture # 16 &17 Complementary symmetry & push-pull Amplifiers
- Class B Power Amplifier
Service of Consumer / Commercial Electronics--Analog amplifiers
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You should upgrade or use an alternative browser. Transformerless push-pull tube circuit?? Thread starter Learner Start date Apr 28, Learner Well-known member. Joined Jun 4, Messages Location Area Hi guys, I have been trying to figure out how to build a transformerless tube push-pull circuit but haven't had much luck in finding a sample circuit to learn from, can someone point me on the right direction to build such a circuit???
Can this be done??? Thanks in advance!! I don't quite get the question? Jakob E. I see, right. I was under the assumption that a tube push pull circuit was restricted to using 2 tubes connected together by their cathode driving by a phase splitter with their plate coupled by a CT transformer, since that's all I can find in the RDH under class B amplifier and looking at the transistor push pull it has PNP BJTs where there is no PNP tubes By connecting a variable resistor from the plate of the bottom tube to the grid of the top tube??
I would assume that would alter the output gain also? Over at tubecad. There was a compendium of amplifier circuits done in Japan some years ago. I don't have it, but I recall a 6AS7-based direct coupled amp for headphone drive. It used feedback to reduce the already low output Z of the AS7's. It was a balanced design if memory serves rather than a SRPP or White follower, and must have had something to keep the d. CJ Well-known member. Joined Jun 3, Messages 14, Location California.
It uses parallel 6as7 tubes to lower the output impedance without transformers. There's alot of stuff around for OTL amps if you google too. NewYorkDave Well-known member. Read up on Julius Futterman. In layman's terms, the main differences between the two are as follows: you'd use a WCF if you wanted a beefy cathode follower with very low output Z that can drive a fairly tough load. You might use an SRPP if you need just "low-ish" output impedance and some voltage gain to boot. I think the SRPP is kind of over-used and trendy these days, but that's just my opinion.
Futtermanthat's who I was trying to remember. Thanks NYD. As I recall though, he did use an output coupling cap. No transformer though. Needed a ohm speaker. Based on the Wiggins "Circlotron" output circuit. Fully balanced, no caps, no nothing. Straight into the 8 ohm speak, so use a fuse! I think I'll be better off sticking with the coupling transformer Is your objective to pass d.
Marik Well-known member. It's a good-sounding richness of some sort, but they definitely aren't the cleanest amps out there. Peace, Al. Great site Marik! They are missing the Alan Kimmel design. I got to build one of those beasts! The thought of volts dc sitting millimeters away from an 8 ohm speaker, talk about listening on the edge of your seat! Learner, did you ever build that LA2?
None of them sounded right to my ears as OTL with low ohm speakers. I had a couple of Ohm old speaker drivers, and with them or OPT they were fine.
They needed lotsa NFB and were quite unstable. No global NFB, huge and inefficient, but together with plasma tweeters and TL subwoofer, they sounded actually pretty amazing. With them in winter time I did not need to turn on a heater. It was in Phoenix, Arizona, so unfortunately 10 months a year I had to pay extra AC bills, to cool the room not only from the wheather, but also from these beasts.
Then I met my girlfriend now wife and she won--the system had to go. PRR Well-known member. The only sane way to get big work out of a vacuum tube is to transformer-couple. Remember that most loads are conductors voice-coils and the vacuum inside a vacuum tube is a very BAD conductor. That's terrible for power transfer.
For small work, you can R-C couple. You can even redefine "small" as "big" if you use a "very-very-big" tube. This is not rational design. But most present-day tube work is irrational. And has voltage gain. But when you put a heavy load on it, it sucks less than any comparably simple design. It isn't true Push-Pull neither is a SRPP but can be designed to stay mighty close to push-pull operation over a useful range of very low load impedances.
In this range, it is very inefficient: no worse than any other transformerless design with comparable tubes, but very much worse than a transformer coupled design. If audio transformer pricing were rational, we wouldn't even consider such kludges. In fact, that exactly what I am looking to do but I can not find any push pull circuit being done that way to see how its done.
Here is the schematic That was mighty helpful! Post reply. Insert quotes…. Similar threads. Help understand this tube effects loop circuit. Replies 15 Views Aug 9, bjosephs. Trying to understand Baxandall EQ. Replies 21 Views Oct 26, CurtZHP.
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US3399354A - Transformerless push-pull transistor amplifier with feedback - Google Patents
A push—pull amplifier is a type of electronic circuit that uses a pair of active devices that alternately supply current to, or absorb current from, a connected load. This kind of amplifier can enhance both the load capacity and switching speed. Push—pull outputs are present in TTL and CMOS digital logic circuits and in some types of amplifiers, and are usually realized by a complementary pair of transistors , one dissipating or sinking current from the load to ground or a negative power supply, and the other supplying or sourcing current to the load from a positive power supply. A push—pull amplifier is more efficient than a single-ended "class-A" amplifier. The output power that can be achieved is higher than the continuous dissipation rating of either transistor or tube used alone and increases the power available for a given supply voltage. Symmetrical construction of the two sides of the amplifier means that even-order harmonics are cancelled, which can reduce distortion. However, the push—pull amplifier requires a phase-splitting component that adds complexity and cost to the system; use of center-tapped transformers for input and output is a common technique but adds weight and restricts performance.
Analog Electronics Lab
Audio amplifiers are the classical, commonly used electronic circuits; especially, in the applications of high wattage amplifiers; where the Class A audio amplifiers are the most acceptable and have the best sound quality. However, they would have low rate of expansion, as well as, low efficiency. For example, the famous Class A circuit model: Krell KSA that consists of power amplifiers with 3 pairs of composites using the power supply plus minus 45 volts can cause high current and high power consumption all the time, i. This results in high total current to reach 3 amps or watts at all times. The researcher will conduct research to reduce the power loss in such conditions by reducing the power supply voltage more the circuit is still ready to expand the audio signal effectively as previous. Experiment by adjusting the input voltage with AC power transformer, can be adjusting from 28 to volts, to allow DC power to vary the voltage in the range of 10 and 45 volts. Input mV p-p input signal, 1kHz Sine wave frequency at 8-ohm load and reduced the voltage from 45 volts until the output amplifier can still maintain the input signal. Experimental results show that when reducing the power supply voltage, the power loss is reduced accordingly. Where the output signal remains distorted as the input signal is not distorted. This article describes the techniques for adjusting the voltage appropriately for Class A audio amplifiers circuit and the study of the enhancement of Class A audio amplifiers with the technique to crease the TD circuit Tracking Class D or DC voltage distribution circuit for the final power expansion According to the size of the audio signal received the input using a bit processor as an automatic control to develop Class A audio amplifiers for better performance.
Push pull amplifier

The principal disadvantage of the push-pull amplifier circuits we have discussed so far is the cost and bulk of their output transformers. High-power amplifiers in particular are encumbered by the need for very large transformers capable of conducting large currents without saturating. Figure a shows a popular design using complementary PNP and N PN output transistors to eliminate the need for an output transformer in push-pull operation. This design also eliminates the need for a driver transformer or any other drive circuitry producing out-ofphase signals. Figure b shows that current flows in a counterclockwise path through the load when the input signal on the base of NPN transistor QI is positive.
Engineering:Push–pull output
A push—pull amplifier is a type of electronic circuit that uses a pair of active devices that alternately supply current to, or absorb current from, a connected load. This kind of amplifier can enhance both the load capacity and switching speed. Push—pull outputs are present in TTL and CMOS digital logic circuits and in some types of amplifiers , and are usually realized by a complementary pair of transistors , one dissipating or sinking current from the load to ground or a negative power supply, and the other supplying or sourcing current to the load from a positive power supply. A push—pull amplifier is more efficient than a single-ended "class-A" amplifier. The output power that can be achieved is higher than the continuous dissipation rating of either transistor or tube used alone and increases the power available for a given supply voltage.
Lecture # 16 &17 Complementary symmetry & push-pull Amplifiers
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Class B Power Amplifier
The bipolar junction transistor BJT and the field-effect transistor FET both control the current flow at their output terminals collector and drain, respectively , and in both cases this current at the output can be controlled by the voltage at the input. The values of mutual conductance obtainable from bipolar transistors are much greater than are those from FETs. In the mutual conductance graph shown in FIG. The examples here are mainly for BJT circuits.
Highly informative details been imparted by you. I like the way you share useful data in a representative way, making it easy for many readers to understand. Best tuition services are provided by TheTuitionTeacher in Delhi. Sunday, July 7, Home » Amplifier » Class B Amplifier.
Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Push-pull class-AB transformerless power amplifiers Abstract: One of the major problems in power-amplifier design is to combine high efficiency with thermal stability. Class-C operation with current drive is one possibility but distortion level is high due to crossover and nonlinearity of h FE.
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