I got this, but saw no polarity markings like my other larger piezo buzzer. Andy Piezo Transducer Electrical Specifications: Rated...

I got this, but saw no polarity markings like my other larger piezo buzzer. Andy Piezo Transducer Electrical Specifications: Rated Voltage: 5Vp-p Rated Current: 2mA (max) Sound Output at 10cm: 85 dBA Resonant Frequency: 2.04kHz Dimensions: 8.43mm H x 12.1mm diameter Number of pins: 2 Pitch: 6.5mm Lead thickness: 0.62mm PC mount Markings: 1...

Hi all, A member of our radioclub is starting to have problems with his eyesight, so he is looking for a multimeter that can...

Hi all, A member of our radioclub is starting to have problems with his eyesight, so he is looking for a multimeter that can talk. I've found one on the internet, but that product is only sold in the US. Anybody any idea for a not to expensive talking multimeter that can be purchased here in Europe? thx! Kristoff

Hello, My Motorola phone supports "Turbo" charging, apparently charging my phone at 9-12V after establishing a secret handshake with the...

Hello, My Motorola phone supports "Turbo" charging, apparently charging my phone at 9-12V after establishing a secret handshake with the charger. https://www.motorola.com/us/products/turbopower Is there a chip that performs this authentication? I'd like to build a car charger for my phone without blowing it up, but I haven't seen any sample schematics. All I've seen is a reference t...

Hello, What are some examples of oscillators which don't require transistors or vacuum tubes? So far I found relay oscillators and the...

Hello, What are some examples of oscillators which don't require transistors or vacuum tubes? So far I found relay oscillators and the Pearson-Anson oscillator. Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would it work on LEDs as well? https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect Relay oscillators look neat too but I don't imagine they would la...

Is it reasonable/possible to build an 8 amp 20 V transformerless power supply from a 120Vac line. I calculate about 180uf plus or minus...

Is it reasonable/possible to build an 8 amp 20 V transformerless power supply from a 120Vac line. I calculate about 180uf plus or minus depending on other components. Maybe 9- 20uf caps in parallel? I'd like to build it into a leaf blower. All plastic, absolutely no metal exposed. I think I've answered my question, I have 12, X rated caps in my junk box, but they are only...

Is there any consensus on the neatest circuit to take a noisy push button signal and output a clean rectangular pulse? Searching through my...

Is there any consensus on the neatest circuit to take a noisy push button signal and output a clean rectangular pulse? Searching through my ancient (paper) files I found dozens, but my scribbled notes on many show that when tested I'd found lots failed, allowing some noise to reach the output. My starting assumption is a simple CR filter in front of a Schmitt. But before I head for the shed...

I looked at an ampacity table but it was confusing. Would a 4 ft. length of 18 AWG wire be ok for a 10 amp load.? (Circular saw) Thanks, ...

I looked at an ampacity table but it was confusing. Would a 4 ft. length of 18 AWG wire be ok for a 10 amp load.? (Circular saw) Thanks, Andy

Varistor/MOV Spice Modeling has been updated. See VaristorMOV.zip on the Device Models & Subcircuits Page of my website. ...

Varistor/MOV Spice Modeling has been updated. See VaristorMOV.zip on the Device Models & Subcircuits Page of my website. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Sa...

My 20 year old burglar alarm control has developed a fault that I've spent the last couple of days trying to fix. Before I ditch it and...

My 20 year old burglar alarm control has developed a fault that I've spent the last couple of days trying to fix. Before I ditch it and go through the hassle of installing a new one I'm seeking help here please. Q1: An extreme longshot as I researched in 2012 but the company had long folded, but... Anyone have or know a source of the circuit diagram for the Autona 2250 Control Unit? FWI...

I dont have a capacitor tester. (Well a very small one on my Digital meter) I want one that is good general use. Some seem to only go to 100 or...

I dont have a capacitor tester. (Well a very small one on my Digital meter) I want one that is good general use. Some seem to only go to 100 or 200 uF. I think you really need something that goes to maybe 4000uF. I looked at some electronics I have they have for example 2200uf. I want to spend less than 100 Canadian. I have seen a few Honeytek A6013L Capacitor Tester or Klein mm1000 which s...