Hobby Electronics Basics

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Are rechargeable ALKALINE CELLs still available?

Some called 'grandcell' which I've used for 2 years need to be replaced, but they've gone off the market here. Have thes...
9 comments posted 16yrs
posted by no.top.post
9 comments posted 16yrs posted by no.top.post

Cordless drill power supplying scooter motor?

Does this sound right? drill battery and controller no-load driving the drill motor lowest-speed 1 amp full throttle 2....
2 comments posted 16yrs
posted by jdoe
2 comments posted 16yrs posted by jdoe

LCD Without Wire Connectors

I have a Radio Shack count-up/count-down timer, catalog #63-878. It's about 2.5"x3.2"x0.70" thick. It's around 10 years...
4 comments posted 16yrs
posted by none
4 comments posted 16yrs posted by none

analog switch

How can design analog SPDT switch which switches VCC between +3.3V and 5V depending on application? I've an available p...
21 comments posted 16yrs
posted by ravi2neha
21 comments posted 16yrs posted by ravi2neha

36v power tool motor to replace scooter motor?

Does this sound right? motor shaft revolutions per scooter wheel revolution 8.15 wheel circumference 39.27" wheel movem...
5 comments posted 16yrs
posted by jdoe
5 comments posted 16yrs posted by jdoe

low frequency amplification

Hello, I have a question about where do frequencies end and pulses start? I'm trying to make an impact detection circui...
11 comments posted 16yrs
posted by panfilero
11 comments posted 16yrs posted by panfilero

Voltage Reflection Coefficient Question

In Wes Hayward's book "Introduction to Radio Frequency Design" on page 116, the voltage reflection coefficient is given...
2 comments posted 16yrs
posted by bitrex
2 comments posted 16yrs posted by bitrex

Linearily of Derivative Circuits At High Frequency

To get to a higher frequency, is it possible to just use a smaller cap and/or resistor on op amp derivative taking circu...
21 comments posted 16yrs
posted by BretCahill
21 comments posted 16yrs posted by BretCahill

Convert Bits/sec to Hz

I understand that they are different domains (Hz - analog and bits/sec - digital), how would one convert e.g., 1Gbit/s t...
18 comments posted 16yrs
posted by dakupoto
18 comments posted 16yrs posted by dakupoto

Voltage required

I have an external hard drive, taken from an older computer, in a Dick Smith external enclosure. During a move I got al...
3 comments posted 16yrs
posted by dewhurst
3 comments posted 16yrs posted by dewhurst

Sampling Only When SNR Is Above Some Limit

In some situations the time periods when noise will be an issue are easy to identify. Instead of subtracting or filteri...
2 comments posted 16yrs
posted by BretCahill
2 comments posted 16yrs posted by BretCahill

Getting started with Switcher design

I've seen switching power supplies mentioned occasionally here. I'd like to learn about designing such power supplies:...
11 comments posted 16yrs
posted by egernet
11 comments posted 16yrs posted by egernet

can I run MC1496 (modulator) w/ 80MHz carrier?

Hi, for reference: http://www.onsemi.com/pub_link/Collateral/MC1496-D.PDF Can I run this chip with an 80MHz carrier? I'm...
1 comments posted 16yrs
posted by com
1 comments posted 16yrs posted by com