Hobby Electronics Basics

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charge pump for Jim

https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/5-to-12-pump.JPG If you have trouble understanding this, jus...
9 comments posted 10yrs
posted by jjlarkin
9 comments posted 10yrs posted by jjlarkin

Wifi or bluetooth inter face

Any cheap ideas on a cordless interface between a pa amp 20 metres away and a computer,video projector and cordless mike...
1 comments posted 10yrs
posted by haggisz
1 comments posted 10yrs posted by haggisz

finding laser diode parameters

I made a bulk purchase of red laser diodes off Ebay. There are three bags together unmarked. 25 of them are 3.3V., anot...
14 comments posted 10yrs
posted by cbx
14 comments posted 10yrs posted by cbx

Noob Q - LM337 SOIC: four Vin's?

What is the purpose of having 4 pins assigned to Vin? Layout convenience? http://www.ti.com/lit/ds/symlink/lm337l.pdf Th...
2 comments posted 10yrs
posted by not
2 comments posted 10yrs posted by not

OT Should I terminate this input?

I'm making a better electric bike, taking ages but going well. https://www.flickr.com/photos/27532210@N04/? The first p...
8 comments posted 10yrs
posted by always.look
8 comments posted 10yrs posted by always.look

Very high value resistors

It seems there are resistors around in the range of 50Gohm! Having never encountered anything beyond 10M., I never imag...
54 comments posted 10yrs
posted by cbx
54 comments posted 10yrs posted by cbx

Halving Pulse Width/ Pulse Width Division

I have a pulse train generated by a 555 timer in astable mode. The period is about 90s and the duty cycle is about 5%....
14 comments posted 10yrs
posted by cbx
14 comments posted 10yrs posted by cbx

OT: Lead Acid Float Charger

I drive my pick-em-up truck every few months. So the battery is dead when I go to use it... like today :-( I'm looking...
54 comments posted 10yrs
posted by To-Email-Use-The-Envelope-Icon
54 comments posted 10yrs posted by To-Email-Use-The-Envelope-Icon

J308 for really-low voltage oscillator

Hey, I am looking for a J308, but it looks like it's obsolete. http://www.mouser.com/ProductDetail/InterFET/J308/?qs=Ox...
27 comments posted 10yrs
posted by mrdarrett
27 comments posted 10yrs posted by mrdarrett

Headphone amp report

Over the weekend I finished both the tube amp and the O2 amp. The tube amp sound is ho-hum. I'm not thrilled. On the ot...
0 comments posted 10yrs
posted by etpm
0 comments posted 10yrs posted by etpm

CapsLock

https://dl.dropboxusercontent.com/u/53724080/Gear/CapsLock.JPG -- John Larkin Highland Technology, Inc lunatic fringe el...
0 comments posted 10yrs
posted by jjlarkin
0 comments posted 10yrs posted by jjlarkin

What's the use of an OTA?

Hi all, I am embarking on a project to "recreate" the sound of a 1990s Drumfire sound board. Somebody posted a plan on...
7 comments posted 10yrs
posted by c.difficile
7 comments posted 10yrs posted by c.difficile

Vacuum tubes and emps

Would a transmitter or receiver based on vacuum tubes survive and work after a nuclear EMP without a Faraday cage? Thank...
4 comments posted 10yrs
posted by mrdarrett
4 comments posted 10yrs posted by mrdarrett

Equalizers

Related to my two previous posts today I'm wondering about portable equalizers to go with my portable headphone amps. P...
5 comments posted 10yrs
posted by etpm
5 comments posted 10yrs posted by etpm