Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Hi, Sorry that the radio is 40 years old, older than me. Years ago I was looking inside to get magic. Maybe that time I misadjusted these IF transformers. I do not use the radio much but sometimes SW and MW attract me as amateur radio hobby. And now I realise that what I did in the past with...
Hi,
I have an old radio from National Panasonic, almost the same as the attached schematic. Mistakenly IFT of the radio are wrongly adjusted. I searched a few articles and most of them suggest making an AM-modulated 455KHz frequency generator and aligning the IFT to get a modulated AM tone...
OK, the datesheet said the device similar to this looks like "1-Wire EEPROM" and its application has "Ink and toner catridge indentification". Does this mean it just indentify the catridge OR it counts the printing copies, to brick the printer in certain time? Do I have to replace a new genuine...
The Xerox Workcentre 5020 has a huge catridge and the catridge has a TO-92 component as attached image. The catridge just uses its 1st and second pins only. I tried to search its part number but unable to get detail datasheet. Do I have to say it's a secret part for Xerox by DALLAS?
This types of cheap steam inhaler has just two steal rods dipped into the fresh water. After applying mains to the rods, water starts to boil primarily just around these these mains rods. So I think it is not pure hot water steam. Do I have to say it's a smoky steam of 220v shorted through...
Hi again, Another interesting 'not rated rating' is RF power output (P in and P out) of some RF purpose transistor like 2sc3357 (SMD). The transistor has great transient frequency of around 6GHz and has 1.2 watts power dissipation and 100mA collector current. Maybe it means it can push more RF...
Hi, As an example, I have upload a datasheet of 2sc2328 audio purpose transistor. The datasheet clearly mentioned it as Audio Power Amplifier transistor. But in detail the transient frequency or current gain band product has "120MHz at 2V, 500mA". If the transistor is designed to drive audio the...
Many system has shield and it is grounded like condenser mic, signal cables, micro level preamp etc. What happens if I made a shield but did not ground it? Some expensive multimeters has shield inside and accroding to my poor inspection/assumption, that is not grounded. Curious about floating...
Hi again, when I got this $6 DMM, I was a student and it was affordable to me. Currently any bluetooth model DMM is not arrived in Nepal. Nepal's biggest online shop Daraz has nothing about bluetooth DMM. It has been an year that we Nepalese can buy stuff from abroad. Now I am planing to buy a...
Hi, I am using a $6 DT9205 multimeter from a decade, with Max 1000V DC input. Watching many videos on youtube is inspiring me to add some input over voltage protection. If I used a MOVs then the capacitance will be added to its capacitance measurement or something else. So I am thinking about a...
Hi, I have many outdated CFL lamps and Most of them has fused tubes in one side. Normally fine electrod has around 5 ohms. Today I bypassed the fused one electrod ('Lamp1' in the circuit) with a wire, (another side was fine) and it is glowing same as good condition. But tube temperature is...
Hi,
A motorcycle's self-starter was not working sometimes and was working very well sometimes. I thought the battery started to damage. Or going through deep discharge. It is unusual that sometimes after driving approx 5KM, the seft-starter does not work (just makes a sound like a low voltage...
Hi,
Every Li-ion battery comes with its own circuit attached. I know it is very useful to cut off the supply when cells get full discharge. Does this protect from OVER CHARGING too? If it protects from over charging then can I say a charging IC in most of the basic cell phone is optional or...
Hi, I have never seen before any CMOS IC used in a core part of RF circuit like this: https://www.qsl.net/p/py2ohh/trx/goitacas/goitacas.htm This 7MHz transceiver uses 74HC4066 IC as a receiver, buffer driver etc. I can easily find the transient frequency of a transistor in datasheet but I have...
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