Truck Starter/solenoid/battery help

Started by amdx in sci.electronics.design3 years ago 48 replies

> I'm having very intermittent lack of starter rotation on a Toyota > T-100. Over the last 14 years I have replaced the contacts in the ...

> I'm having very intermittent lack of starter rotation on a Toyota > T-100. Over the last 14 years I have replaced the contacts in the > solenoid and more recently (1 to 2 years) replaced the starter. > For trouble shooting I have a meter with one lead connected to the > bolt on the solenoid and the other to the frame. (solenoid is built into the starter) > The plan is; if


Solenoid redux

Started by George Herold in sci.electronics.design4 years ago 1 reply

I was just reading this, http://electronicdesign.com/analog/what-s-all-solenoid-driver-stuff-anyhow and was reminded of solenoid thread here a...

I was just reading this, http://electronicdesign.com/analog/what-s-all-solenoid-driver-stuff-anyhow and was reminded of solenoid thread here a few weeks back.=20 (JL=92s circuit 7 IIRC) =20 I like using the coil 'kick' to reset the cap.=20 Make sure to read the circuit by izapitoften, in the first comment.=20 George H.


Audio circuit to drive solenoid

Started by Doug B. in sci.electronics.design9 years ago 11 replies

Hello all, I am looking for some design help on a circuit to control a rotary solenoid using an audio signal. First, some context: This is...

Hello all, I am looking for some design help on a circuit to control a rotary solenoid using an audio signal. First, some context: This is for a musician/artist friend who is building a prototype of a new musical instrument. The instrument consists of a series of nitinol (MuscleWire) strings that are plucked by a wooden stick attached to a rotary solenoid. He currently has eight strings+...


electron beam through solenoid coil

Started by Jamie M in sci.electronics.design6 years ago 13 replies

Hi, How does a solenoid act to focus a beam of electrons that are passed axially through the coil? cheers, Jamie

Hi, How does a solenoid act to focus a beam of electrons that are passed axially through the coil? cheers, Jamie


Miniature solenoid

Started by Prof78 in sci.electronics.design6 years ago 10 replies

Looking for a miniature (micro) latching solenoid mechanism to effectively replace a latching reed relay used to introduce...

Looking for a miniature (micro) latching solenoid mechanism to effectively replace a latching reed relay used to introduce a calibration current, e.g. 1femtoamp, into the input of a very high gain transimpedance amplifier (100Tohm) so that in normal operation the 'relay' is completely disconnected to avoid leakage. Stroke required is small (say ~2mm) and time response is not impor...


closed loop control of solenoid frequency and stroke

Started by Brandon in sci.electronics.design8 years ago 24 replies

I have a project in which I would like to produce a "smooth" reciprocating motion with an adjustable stroke length between about 1 mm and 2 mm...

I have a project in which I would like to produce a "smooth" reciprocating motion with an adjustable stroke length between about 1 mm and 2 mm and an adjustable frequency between 100 Hz and 150 Hz. I think there might be some advantages to using a solenoid for this (as opposed to a rotary motor and a mechanical design) but only if I can get good feedback control of the stroke and frequency. ...


Magnetic Fields and Solenoid

Started by Anonymous in sci.electronics.design5 years ago 3 replies

Hi, I am using the following magnetic core to make a solenoid of inductance 12u= H...

Hi, I am using the following magnetic core to make a solenoid of inductance 12u= H (A11) http://www.ferroxcube.com/prod/assets/3c94.pdf Part Number: ROD 6/ 20 /3C 90. Its 6mm in diameter, 20.3 mm in length and u= i =3D 2300. I used the 20 AWG gauge solid wire.=20 You can find the schematic of the circuit at the following link=20 =20 http://img217.imageshack.us/img217/3215/induct...


Drive Solenoid with Push Pull

Started by Anonymous in sci.electronics.design5 years ago 20 replies

I have an audio amp module that has a push/pull output. Can this be used to drive a plunger type solenoid? I am concerned that the current...

I have an audio amp module that has a push/pull output. Can this be used to drive a plunger type solenoid? I am concerned that the current reversal at each half cycle would cause the coil to alternate between N-S and S-N, thereby making the plunger move twice per cycle, first in one direction and then in the other. If this is inadvisable, can I use a diode to recitfy the drive signal? ...


Water solenoid buried control line dscovery

Started by Robert Baer in sci.electronics.design3 years ago 10 replies

Say have 8 control lines from timer box go out,each to a given water on/off solenoid. Given that only two were eye findable since they...

Say have 8 control lines from timer box go out,each to a given water on/off solenoid. Given that only two were eye findable since they were above ground or in protective box at ground level. All other solenoids/valves are below ground and no clue concerning location (within 50 feet or so). Control lines and common are inside metal pipes. Some of the solenoids got jammed/pl...


Solenoids

Started by Don Y in sci.electronics.design3 years ago 20 replies

Hi, What (and how!) can I deduce about the operation of a particular (e.g., previously empirically characterized) solenoid by observing it's...

Hi, What (and how!) can I deduce about the operation of a particular (e.g., previously empirically characterized) solenoid by observing it's electrical characteristics UNDER OPERATION? E.g., I can tell if the coil is *open*, obviously enough. Likewise, I can tell if it has been shorted. [Of course, these assume you can resolve the differences with whatever detection means you employ]...


Dimensionally Plotted Field with XY Coils

Started by Anonymous in sci.electronics.design4 years ago 8 replies

This is a mad scientist project, and I am not even sure how to ask the question correctly. What I have in mind is to create a zone of "EM...

This is a mad scientist project, and I am not even sure how to ask the question correctly. What I have in mind is to create a zone of "EM texture" using two solenoid coils at right angle to each other. These are not crossed but effectively form two sides (or a corner) of a square. The concept is to feed them with different arbitrary signals, such that the composite perpendicular field ...


Irrigation valves - anybody use one?

Started by mkr5000 in sci.electronics.design2 years ago 11 replies

I know it's off topic a bit but this is my go to group for real answers. Have any of you guys messed with inline irrigation valves? I never have...

I know it's off topic a bit but this is my go to group for real answers. Have any of you guys messed with inline irrigation valves? I never have and have a new Rainbird valve that needs 24vac so I simply connected it to a 24vac (20va) control transformer I had and the solenoid chatters like crazy, so quickly disconnected it. (Usually when I hear chatter it means a need for DC but th


PWM and dither

Started by Pasquale in sci.electronics.design10 years ago 22 replies

Hi, I need to control a solenoid valve using PWM but I have also some specifications about "the dither" in order to reduce friction etc.. I now...

Hi, I need to control a solenoid valve using PWM but I have also some specifications about "the dither" in order to reduce friction etc.. I now what the dither is able to do in theory. I now how to built an electronic circuit concerning PWM (I'd do that using a micro plus a MOSFET etc.) but I don't have any idea about "the dither". Should I sum another PWM with lower frequency to the hi...


E&M theory: resonator question

Started by Tim Williams in sci.electronics.design4 years ago 9 replies

Has anyone ever seen analysis, formulas, data, etc. concerning (if it's even a word) helicotoroidal resonators? Banal example: any toroidal...

Has anyone ever seen analysis, formulas, data, etc. concerning (if it's even a word) helicotoroidal resonators? Banal example: any toroidal inductor, single layer winding. Example: chokes with single layer windings, most CTs. The simplest case ought to be the thin toroid (the physicist's old standby): if the properties of a thin (or infinite) solenoid (helix) are known, it should be...


OT: Sprinkler valve question

Started by Joerg in sci.electronics.design5 years ago 62 replies

Ok, guys, got a set of sprinkler valves under the house. Beats me why, that was a rather stupid decision of the builder. I've replaced a...

Ok, guys, got a set of sprinkler valves under the house. Beats me why, that was a rather stupid decision of the builder. I've replaced a broken one a few years ago and now that same zone is rattling like crazy. Makes the pipes before the valves jump up and down. This is not a simple turn on-off type water-hammer but more like a continuous jackhammer noise. So I measured the solenoid, 35ohms...


Weird EM question

Started by bitrex in sci.electronics.design3 years ago 2 replies

Suppose I have a hot cathode gas filled tube, argon or xenon or something. The tube is embedded in a solenoid such that the B field is...

Suppose I have a hot cathode gas filled tube, argon or xenon or something. The tube is embedded in a solenoid such that the B field is orientated parallel to the axis of the cathode and anode. The B field would have a RMS amplitude of say, approximately 0.1 Tesla. Because of ionization the electron paths under the influence of this field probably become chaotic, so we have a good...


Re: LTspice question: modelling a solenoid

Started by Phil Allison in sci.electronics.design9 years ago 23 replies

"John Nagle" > I need to model the "selector magnet" of a Model 15 Teletype. > This is an electromagnet with an iron core. > DC...

"John Nagle" > I need to model the "selector magnet" of a Model 15 Teletype. > This is an electromagnet with an iron core. > DC resistance is 55 ohms. Inductance is 4 Henries. ** How did yo get that 4H figure?? Iron core solenoids are not pure inductors - they are "lossy inductors" with phase angles of about 45 degrees. ... Phil


Portable Electronic Glass Stength Tester

Started by Anonymous in sci.electronics.design4 years ago 33 replies

I would like to inquire regarding circuit design options for a custom-made testing device. It is intended to test the breaking strength of...

I would like to inquire regarding circuit design options for a custom-made testing device. It is intended to test the breaking strength of glass sheet on solar panels in the field. Hence, it needs to be portable, running off something like two 3.7V Li-ion batteries. The concept is to use a solenoid-type plunger that is activated one time by a push button. This strikes the glass with a...


"Input" on an "output"

Started by Don Y in sci.electronics.design4 years ago 53 replies

Hi, I've added four hose bibbs around the yard, each behind an electric solenoid (24V). The intent is for supplemental irrigation for new...

Hi, I've added four hose bibbs around the yard, each behind an electric solenoid (24V). The intent is for supplemental irrigation for new plantings, etc. (attach hose to hose bibb; run hose out to be proximate to the new planting; "program" irrigation system to dispense water via this particular "hose circuit" for the several weeks required to get root system established) I'd like to ...


Dual Offest Sub-audio Test Signal

Started by Anonymous in sci.electronics.design3 years ago 41 replies

Can someone please help with this project. I am unable to find anything similar in the form of an existing design. The objective is to apply...

Can someone please help with this project. I am unable to find anything similar in the form of an existing design. The objective is to apply a 10Hz test signal, generated with a lab function generator, to two air core solenoids of 50R. OK, here is the different part. One solenoid must be fed with a positive offset signal, and the second with an identical negative offset signal. Gi...