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Ryan, One thing to remember is that crystal filters have always been considered to be *upper* sideband filters primarily. They don't have infinitely steep firewalls at each end of the

Joe, Since you put in a new chip and no audio.. could mean a short at the speaker jack or speaker. If you turn up the volume does the current go up? does the chip get warm ? Did you have any audio

This is exciting news - I ordered mine on 2/19. As for the 2822 chips, I've decided to put a regulator in their B+? line before ever powering them up. Thanks!

Jerry: I cite those only as examples. You are right -- the IRF510 was chosen by WA2EBY both because it was the most workable and one of the cheapest solutions. And now one can get good devices made

Just FYI: Center Frequency: 700 Hz Bandwidth: 200 Hz DC Power: 5VDC GAIN: Upto 20dB via R11 and R12 + trimpot. Resistors 1206 SMD: R1 33k R2 33k R3 1M R4 47k R5 47k R6 36k R7 36k R8 10k R9 750k R10

Maybe, if they work ill put the extra ones up with my RadionoI2C boards....

Nice. ?Are you selling these boards? Regards Simon VK3ELH

Im loving the cheap and easy EasyEDA/JLPCB boards and simple web designer. This time its a CW filter similar to the QCX and HiPerMite. I take no credit for the design, just copied it and added a

Greetings, ? ? ?I finally got my uBitx assembled and in the case of it's final destination.. I checked my wiring on everything, and nervously applied power..? ?Display came up and I was happy..

These HEXFETS are rated for 200V and 50A. They will (sorta) work as you have shown. But the gate input capacitance is 4000+ pF. That increases your standing wave in the drive circuit and lowers your

I have learnt to live with just about any iron. What matters really is a nice clean tip. These days they are tips that don't pit. I like those. Keep a good sponge, wipe them often. - f

The images of what I needed minimum. It looks like the station is not available but there are ones with more features around 70$. Chris

I find that holding my own hands sill enough to put a part the size of a couple grains of rice on a pcb without lifting a pad or tossing it on the floor is difficult for me even. Im 33! It looks to me

All I know is I wasn’t getting the correct voltages on Q90. It was 0 volts dc on all three pins. I was also losing the transmit dc in the vicinity of R84. So I replaced them both. Yeah, I know, kind

Well, pushing the limits on the irf510 mosfets, they caved on me. So, digging through my junk I found four irfp260's and soldered them in as an effort to get back on the air. So far, it seems to work,

Likewise somewhere I have my original Weller Soldering Gun from around 1958! Yes, it still works but I don't really have a use for it. I do have a huge Weller soldering iron for replacing Can

Some of these clones seem to blow for no particular reason. I think we primarily must limit the supply voltage, not so much the current under load. Though they are really good at dealing with

The DPAK package is perfect. http://uk.farnell.com/stmicroelectronics/l78m05abdt-tr/ic-v-reg-5-0v-smd-dpak-3-7805/dp/1366575

Quiescent current into the TDA2822 is around 6ma, peaks can be 1 Amp. Though?100ma might be sufficient for moderate speaker volumes. You would need two resistors for a voltage divider, and maybe

One could use a voltage drop resistor. The higher the current draw, lower would be the voltage to the TDA2822 [email protected]> wrote: