T&L Publications

I'm probably starting to sound like a scratched record here (remember em?) but I suggest you check out rev-ed.co.uk for their picaxe uConts. They are pic based, with a BASIC bootstrap loader. The programming suite is a free download and the only hardware you need is a D9 plug and two resistors. Coup...

From Oz again.
go to
rev-ed.co.uk
and check out the picaxe. programmer is 2 resistors, the software is free and you can be up and running with BASIC in minutes.
Rgds, Lin

Garage door types will do it if you use a couple of dipoles instead of the coiled monopole and/or dangling wire as supplied. I've had well over 1000 meter range yagi to dipole.

Have a look at rev-ed.co.uk Revolution Education. They sell several levels of bootstrapped PICs programmable in BASIC. The cost of the PICaxe chip is little more than the native PIC. The programming suite is a free download and the programming hardware consists of a D9 plug and two resistors. Rgds, LF

I concur with most of the replies above. I'm sounding a bit like a scratched record here (remember black vinyl?). A microcontroller will do it easily. A picaxe 18a has 3 8 bit ADC inputs, will directly control RC servos and is programmable in basic. It costs about $10 here in AUS. The programming so...

Don't get sucked into linear electronics, it's cheaper to buy an amp or filter (or whatever).
Amplifier design is not a science, it's a black art.<p>Digital - go for it!<p>There are 10 kinds of people, those who understand binary and those who don't.

What about a low power laser module? Use a photo darlington transistor as a receiver and maybe even some logic to pulse the laser and check the receiver. You can put the laser on one side of drive, receiver on the other, or you can put both in one box and use a small piece of mirror on the other side.

Thanks for all suggestions so far. I'm using a yagi with folded dipole at TX end but am looking for a receiver antenna (vertical) that is simple to make (cheap!!!). I've thought about a Jpole/zepp but everything I've seen is optimised for 50 ohm feedline whereas I need open wire 300 ohm (ish) matchi...

try your local auto parts or electronic store for car central locking actuators. Cheap and heaps of thrust though draw a fair bit of current at 12V. Also require logic circuitry since no limit switching, they are just a motor, reduction box and rack.<p>Regards, LF

I'm looking for a simple antenna, possibly an end fed dipole. to extend the range of cheap 433.92 hybrid transmitters (garage door opener type). I'm fairly well versed in digital electronics but RF is not my strong point. The antenna would operate in a marine environment but I can construct it to wi...

Don't let uControllers scare u. Have a look at rev-ed.co.uk . Their Picaxe range costs little more than the same PIC chip, is programmed in BASIC, the software is a free download and the programmer hardware consists of a D9 plug and two resistors.<p>Regards, LF

Many good ideas but maybe you are overlooking the obvious. Yes I can design circuits and program micros but for cheap and cheerful try a MECHANICAL regulator. Simplest (cheapest) way is to use the cooling fan to move a wind vane loaded by a spring. A linkage to the throttle will close the loop. Some...

The motors are not steppers (unless they are some sort of variable reluctance type). I am familiar with permag and hybrid steppers. The motors in question have three pairs of leads of quite a light gauge. The terminals are marked C1 C2, K1 K2, B1 B2. I think they turned the PPI yoke in synch with th...

I have acquired a number of dc motors ex a Russian cold war era "trawler". They are well engineered and drove a large scanner from 24V ship's supply. The driver circuitry did not come with the assembly, and all labelling on the motors is in Cyrillic. I suspect that some sort of phasing cir...

If you are new to programming micro controllers I suggest you have a look at rev-ed.co.uk<p>they have a range of micros which are PIC chips but with a bootstrap loader which enables programming in BASIC with a simple serial lead.<p>check the site, the programming software is comprehensive and its a ...