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Hello fellow homebrewers, While waiting for the huff and puff components, i decided to finsih the LF amplifier. Instead of the LM386, I found an LA4185 in my junkbox from an old demolished transistor

Jim, We used to make non inductive resistors specially for some clients in the '80's. In general purpose carbon or metal film resistors, the body is spiral cut at least 60% of the body

Where I work, we have a problem w/ some fiber optic transceivers so we're hand-testing parts for one customer to provide parts that work just for them, and binning the rest by performance numbers. I

Jim, Nope, I was in the resistor manufacturing field. I was managing a factory some years ago.. from the time the resistive element is put on to the end of painting the value on it.. the

A wonderful idea! I suspect that if you wired the resistors in parallel on a 50-ohm stripline PC board with the connectors X-ed on opposite sides of the board, you could cancel out a lot of the

That's fantastic Farhan! I didn't even know that polo's could be found outside the UK! When my brothers and I were kids and used to visit our Grandparents, my Grandmother would always give us each

Thanks Paolo! Reading your web page has inspired me to bring forward my imaginary deadline to the IT department! The monitor is now on death row, awaiting demolition. Those IT boys now have very

While I am at it, I'd like to remind you a simple study I made on two 100ohm 5W resistors found in a PC monitor PSU. See http://www.qsl.net/ik1zyw/hardware/relazione-resistenze.html (part of the page

OK Hans, Tnx for advice. Nice dds design, but i will first try what is possible with the 4-ic huff and puff (2x 74hc4060, 74hc74+opamp). I do not want to make things too fancy for a starter. Maybe

Good idea and simple too, the digital activity is in a narrow part of the spectrum on 20M. A VXO should be good enough. 2 xtals should cover sub-band confortably.. I expect that the

I fixed a ICOM735 encoder with LED parts from an old hi-res mouse. The LED inside the encoder was identical to the one in the mouse. I have seen some enterprising chaps make TV's out

Farhan That has got to be the sweetest transceiver I have ever heard of! Arv _._

Hans Summers wrote: Been there! :-) And written about it. See http://www.qsl.net/ik1zyw/hardware/monitor.html Also featured: VCR, CD-ROM and laptop. One day I will add TV and floppy-disk drives as

Arv That's right! I remember reading about that too. Works very well apparently. I've never tried it. Neither have I ever tried it with the computer mouse, though I've thought about it several

Ron, Raj... Let me add another comment to Hans' response suggesting the use of optical encoders from dead mice (the computer kind!) to tune a DDS system. You can also remove stepper motors from disk

And how about a VXO? Chris.

Ron, Raj... I have a simple DDS design too, which doesn't need microprocessors: http://www.hanssummers.com/radio/dds/index.htm <http://www.hanssummers.com/radio/dds/index.htm> . It would be

Ron, Reminds me of the old days as a youngster building Valve VFO, enclosing it in a box etc.. For PSK: I suggest that you take this requirement to the another extreme and build a DDS VFO !!!

Hello Ron The crystal is 32KHz not MHz! Well, 32.768KHz to be precise, which is an ordinary watch crystal. The 1-chip stabiliser is a little sensitive to adjustment. The resistor ratios in the VFO

Thanks for advice dear Hans, Sure the instability of the vfo will increase the the frequency increase. I was amazed by the one-chip huff&puff circuit on your site with the 32MHz xtal. Effective and