> 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

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.

Is it possible, perhaps using PWM, to slow down the action of a solenoid while still maintaining most of its force? By way of background, I'm...

Is it possible, perhaps using PWM, to slow down the action of a solenoid while still maintaining most of its force? By way of background, I'm considering a solenoid for pressing a rather firm button. The only one I have at present that can do so reliably is a 24V type that delivers its press too fast and too noisily. Lower voltage types (already owned or researched on ebay or Amazon) seem t...

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

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...

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...

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? ...

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...

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]...

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 ...

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

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...

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...

Project: To get images with my iPhone 6S+ of a fox visiting our garden overnight. One approach I’m considering is to tap the button of a...

Project: To get images with my iPhone 6S+ of a fox visiting our garden overnight. One approach I’m considering is to tap the button of a Bluetooth camera shutter gadget (from CAMKIX) with a 500 ms pulse to a solenoid, triggered in various ways. (I don’t want to crack open the tiny case to attempt that with a circuit mod.) That seems reasonably straightforward. But

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...

"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

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...

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 ...

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...

I would like to use a pocket-size MP3 player to feed audio signals direct (no added amp) to a solenoid type coil. The coil resistance itself...

I would like to use a pocket-size MP3 player to feed audio signals direct (no added amp) to a solenoid type coil. The coil resistance itself would be negligible. What is the minimum series resistance required to avoid overloading the player's output? I am thinking maybe 32R? Any suggestions? Bob Kindle