BALUN transformer for capacitive loads

Started by Anonymous in sci.electronics.basics11 years ago 18 replies

Hi, I need to drive 2 capacitive electrodes with out of phase RF (0-100 Vp-p, 10KHz - 1MHz). For this purpose i got myself one of the T&C...

Hi, I need to drive 2 capacitive electrodes with out of phase RF (0-100 Vp-p, 10KHz - 1MHz). For this purpose i got myself one of the T&C power amplifiers (AG1021) with a gain of 53dB upto 1MHz. I planned to use a BALUN transformer from North hills (75 ohm: 75 ohm, 1KHz - 2MHz) to unbalance the amplifier RF. I use a function generator as a source. However, things are not working as i thought...


Transformer

Started by WAZ in sci.electronics.basics11 years ago 3 replies

I am preparing Audio amp using, TBA810, this PCB require 12-0-12 V and 1-Amp Transformer, I have purchased 2-Amp 12-0-12 and this has only two...

I am preparing Audio amp using, TBA810, this PCB require 12-0-12 V and 1-Amp Transformer, I have purchased 2-Amp 12-0-12 and this has only two O/P terminals(i.e +12 -12 There is no Zero) Can I connect 0 terminal of PCB to body of transformer? One other thing , Can i subsitute X-mer of 12-0-12 2-Amp With 9-0-9V 1.5Amp. Thanks Wasim Shaikh


Turns ratio on a 70V 10W Line matching transformer??

Started by royalmp2001 in sci.electronics.basics11 years ago 10 replies

I have come across a project that uses an old Radio Shack 70V 10W Line transformer. The primary has taps for "C", 10W, 5W, 2.5W, 1.25W and...

I have come across a project that uses an old Radio Shack 70V 10W Line transformer. The primary has taps for "C", 10W, 5W, 2.5W, 1.25W and 0.62W The secondary has taps for "C", 4ohms, 8Ohms and 16Ohms. What is the turns ratio if the 5W and 0.62W taps only are used on the primary and the "C" and 16Ohms taps are used on the secondary? How is it calculated?? THanks


Questions about Current Transformers:

Started by theCase in sci.electronics.basics11 years ago 10 replies

I've got a tentative plan to try and log power usage in my home, here's a summary of the plan: 1) Buy two current transformers like...

I've got a tentative plan to try and log power usage in my home, here's a summary of the plan: 1) Buy two current transformers like these: http://www.crmagnetics.com/newprod/ProductView.asp?ProdName=CR3110 2) Place one on each "hot" leg of the 240 volts coming into the house, leaving the ground alone. 3) Place an appropriately sized burden resistor in parallel with each transformer (t...


why did it break

Started by randomname in sci.electronics.basics11 years ago 9 replies

i took a 12v 300ma transformer (meant for a little submersible pump) and cut the wire and stripped it. then i used it as a power supply for a...

i took a 12v 300ma transformer (meant for a little submersible pump) and cut the wire and stripped it. then i used it as a power supply for a simply 555 circuit with about 10 LEDs strobing... for some reason they were strobing a lot faster than with the 6v batteries id been using, so i start switching resistor values. eventually, the transformer just died. why did this happen? whats di...


Transformer lead color

Started by Stumpy in sci.electronics.basics11 years ago 7 replies

I found a power transformer in my garage which I need to use. Primary wires are black. On the other side it has 2 red wires and 2 green...

I found a power transformer in my garage which I need to use. Primary wires are black. On the other side it has 2 red wires and 2 green wires. Is there some standard color code for transformer wire? Only ID on case is 710-4235-03 and then 549-7710. Have not found a part # reference so I guess trial and error measurements are next.


question on RF amplifiers

Started by Strelnikov in sci.electronics.basics11 years ago 5 replies

Hi everybody, I am a beginner in RF. Looking at several linear amplifier diagrams for the UHF range, I almost always see two active stages...

Hi everybody, I am a beginner in RF. Looking at several linear amplifier diagrams for the UHF range, I almost always see two active stages coupled like this: the collector or drain of a previous stage drives a coil connected to the supply rail, then via a capacitor, from the collector the signal goes to a matching element, like a tank or a transformer, and then to the base or gate of t...


Transformer grounded - why?

Started by qwerty in sci.electronics.basics11 years ago 10 replies

I read that the secondary of a high voltage transformer should be grounded. Why? Will it still work if it's grounded?

I read that the secondary of a high voltage transformer should be grounded. Why? Will it still work if it's grounded?


Transformer input wiring fot 120/230VAC

Started by Donald Bauer bellsouth in sci.electronics.basics11 years ago 5 replies

I have a two coil Transformer on for input, one for output and I am unsure about the 120/230 connections. It's a JAMECO 101864 Transformer,...

I have a two coil Transformer on for input, one for output and I am unsure about the 120/230 connections. It's a JAMECO 101864 Transformer, Input Voltage 115/230VAC, 50-60Hz Out 24V/3A I am not sure how to hook up to run on 115V. Just to know, I would like to understand the 230VAC connections, too. The mfr diagram looks like this: The O was a black dot. I see we are using proportional fonts...


Audio amplifier

Started by sahil in sci.electronics.basics11 years ago 8 replies

Hi , I am using an audio amplifier of transistor 2N3055 .It uses two transistors for one channel and 4 for two channel amp.I have two channel...

Hi , I am using an audio amplifier of transistor 2N3055 .It uses two transistors for one channel and 4 for two channel amp.I have two channel amp with 4 transistors and using it with computer.The woffers used are one is 10 inches and other is 12 inches .I want to increase the power of amp.What i shoud do ? i am using 12-0-12 ,1A transformer.Help me to inprove its performance.........


Audio Amp

Started by sahil in sci.electronics.basics11 years ago 3 replies

Hello friends .Its sahil wants ur help. I am currently using an audio Amp of transistor 2N3055 .It uses two transistors for one...

Hello friends .Its sahil wants ur help. I am currently using an audio Amp of transistor 2N3055 .It uses two transistors for one channel .Transformer is of 12-0-12 , 5A .I am not satisfied with the amp performance.I want some what powerful amp schematic whose transistors are easily available .I want to drive 12" SUB WOOFER. Hey I hope U are the person Who can HELP me......Reply .........


Newbie - Current, Voltage, Resistance, Power and Transformer theory

Started by hdjim69 in sci.electronics.basics11 years ago 12 replies

I'm self-teaching myself electronics and the only place to ask questions is in this forum so please excuse me if this has been asked a million...

I'm self-teaching myself electronics and the only place to ask questions is in this forum so please excuse me if this has been asked a million time already but after reading several books, I still have questions on these topics. No real values, just theory in this question. I'm just starting the section on AC and the book is explaining why we (homes and industry) use AC instead of DC and ...


Jacobs Ladder

Started by Michael in sci.electronics.basics11 years ago 21 replies

Hi, I hope you don't mind me posting this here as I guess technically it's not electronics... I'm in the UK and would like to make a...

Hi, I hope you don't mind me posting this here as I guess technically it's not electronics... I'm in the UK and would like to make a Jacobs ladder using a neon sign transformer. Firstly does anyone here have a suitable transformer that I could use? And secondly if I can't find a UK one, can use a US one as long as I step down the voltage to the 110V? Cheers, Michael


High Voltage AC to DC

Started by ZhangLu in sci.electronics.basics11 years ago 3 replies

Hi all, I need high voltage DC of very small amp. So I used IC 555 to produce the fluctuating current and step up using a radio transformer to...

Hi all, I need high voltage DC of very small amp. So I used IC 555 to produce the fluctuating current and step up using a radio transformer to high AC voltage, to about 2Kv. How do I go about converting this high voltage AC to high voltage DC? TQ Newbie


i need to build a 13.8 powersupply

Started by Anonymous in sci.electronics.basics11 years ago 8 replies

Hello, i need to build a powersupply, i know how to regularize the ac current . but i need to know how i make a 13.8 volt power supply with at...

Hello, i need to build a powersupply, i know how to regularize the ac current . but i need to know how i make a 13.8 volt power supply with at least 20 amps. at the shop, they have a 24 volt transformer (plus12 minus12) with 10 amp. how i fit this ? And can i fit two power supply to addition the current amp ? Thx in advandce


Complaint with Gateway Electronics, Chaney Electronics, and Electronic Goldmine

Started by Stevo in sci.electronics.basics11 years ago 6 replies

A while back I purchased an electronic kit from Gateway Electronics. The kit was a Chaney C4530 3 CHANNEL COLOR ORGAN KIT. Electronics Goldmine...

A while back I purchased an electronic kit from Gateway Electronics. The kit was a Chaney C4530 3 CHANNEL COLOR ORGAN KIT. Electronics Goldmine is Chaney Electronics retail outlet for consumers. The kit came with a transformer with a broken lead. First I went back to Gateway to get the transformer replaced and they only offered to sell me another kit. Then I went to Chaney Electronics and I w...


LED Question

Started by Xtrchessreal in sci.electronics.basics11 years ago 19 replies

The people here seem nice. I am building a tube amplifier. I have a 5VAC tap on my Power transformer that I wish to use for some LEDs as a...

The people here seem nice. I am building a tube amplifier. I have a 5VAC tap on my Power transformer that I wish to use for some LEDs as a Power "on" switch indicator. I have a peice of etched glass that I want to light up using a set of LEDs, this array of LEDs will be the "on" indicator when the switch is closed. I imagine running these in a parallel line (probably 8 LEDs) would be ...


AC speed control: shaded pole motor

Started by Anonymous in sci.electronics.basics11 years ago 2 replies

Let's say I have a shaded pole motor, which controls a blower fan (basically a bathroom vent fan). Let's say I have a 12VDC car battery, and a...

Let's say I have a shaded pole motor, which controls a blower fan (basically a bathroom vent fan). Let's say I have a 12VDC car battery, and a 12V-120V step-up transformer. Would it be practical to power (and control the speed of) the motor by having a microcontroller produce PWM square waves? Or is there a better way to control the speed of the motor...? Why the 12V: I suppose I *...


What is this cirquit used for?

Started by Markus Zingg in sci.electronics.basics11 years ago 13 replies

Hi group I bougt a toy in the US which is operated by a lippo cell. The wall wart that came along wiht it is obviousely a US version alas...

Hi group I bougt a toy in the US which is operated by a lippo cell. The wall wart that came along wiht it is obviousely a US version alas working with 110V whereas where I live we have 230V. The wall wart output is rated DC 5.5V 280 mA and is definately only a transformer with a rectifier, a coil and an electrolytic capacitor to flatten out the DC hence unregulated. It plugs into a li...


disposable camera flash circuit

Started by Grostle News in sci.electronics.basics11 years ago 6 replies

I want to alter a circuit: I took out the flash circuitry (board, bulb and battery) from a Kodak disposable camera. The main flash...

I want to alter a circuit: I took out the flash circuitry (board, bulb and battery) from a Kodak disposable camera. The main flash electrolytic capacitor is rated at 330v and 84 mfd. ( I think 84 is the value, but don't have with me at this time) The cap charge comes from a single AA 1.5v cell. It looks like within the flash circuit there is a small transformer with a transistor oscill...