Replacing crystal with external clock signal

Started by Florian in sci.electronics.basics11 years ago 4 replies

I have a chip that wants a specific low-frequency (38k) clock crystal, which are somewhat hard to find and pricy. I could synthesize a...

I have a chip that wants a specific low-frequency (38k) clock crystal, which are somewhat hard to find and pricy. I could synthesize a 38k clock signal, but the chip is not designed to accept an external clock - it wants that 38k crystal and a 10pF series capacitor between two pins. Would it be possible to trick the crystal driver into syncing to an external clock by proper attenuation and...


How to make, where to buy, order 5 kHz, 10 kHz, 15 kHz crystal/ ceramic resonators

Started by la-la in sci.electronics.basics11 years ago 36 replies

Hi, how to make a crystal /ceramic oscilator for a specicfied frequency in kHz range ? Is it posssible to make one on myself, or find someone...

Hi, how to make a crystal /ceramic oscilator for a specicfied frequency in kHz range ? Is it posssible to make one on myself, or find someone to make it ? What is a minimum order quantity for a crystal/c eramic resonator for a specified frequency (kHz) ? Please help me.


Correct crystal oscillator choice.

Started by Anonymous in sci.electronics.basics11 years ago 10 replies

I am building one of these http://plazma.kapsi.fi/diy/lanc_controller/ Its a LANC Controller (ie. remote control) for a Sony camcoder. The...

I am building one of these http://plazma.kapsi.fi/diy/lanc_controller/ Its a LANC Controller (ie. remote control) for a Sony camcoder. The project uses a PIC16F84A chip, which is a programmable microcontroller. I am very comfortable working with assembler, but I am not so profficient with electronics. I'm having a problem with this project. I've assembled everything on a breadboard (th...


VCXO frequency isn't high enough

Started by Anthony Fremont in sci.electronics.basics11 years ago 58 replies

Hello all, I was playing around and saw that my junk box had all the parts so I started tossing this...

Hello all, I was playing around and saw that my junk box had all the parts so I started tossing this together: http://newenglandqrp.org/files/w1aw-receiver.jpg The problem is (well I think it's a problem) is that I'm all the way down to a 10pF cap for the crystal trimmer and the highest frequency I can get out of it is still less than 3580kHz. Pleae correct me if I'm wrong, but I'm t...


variable HF oscillator

Started by Nelly in sci.electronics.basics10 years ago 3 replies

I need to vary the frequency of operation of a transceiver IC from 7MHz to 9MHz. The oscillator needs to feed into the crystal oscillator input...

I need to vary the frequency of operation of a transceiver IC from 7MHz to 9MHz. The oscillator needs to feed into the crystal oscillator input and crystal oscillator output pins of the IC (the current design does not have a variable oscillator and is just using a crystal). Ideally I would like to control the frequency of the oscillator using the PWM of a micro controller (unfortunately the...


motorola v6 LCD,v8 LCD,K1 LCD,K2 LCD,K3 LCD

Started by jimma in sci.electronics.basics10 years ago

www.cellphonepartszone.com export Mobile phone oem accessories motorola MPX housing,motorola V8 housing,motorola v3m...

www.cellphonepartszone.com export Mobile phone oem accessories motorola MPX housing,motorola V8 housing,motorola v3m LCD,motorola accessories, motorola v3 housing,motorola v3 keypad,motorola v3 flex cable,motorola v3 LCD, motorola v3 lens,motorola v3 battery,motorola v3 charger,motorola v3 car charger, motorola v3 data cable,motorola v3 silicon skin case,motorola v3 crystal case, motorola...


Very basic crystal question

Started by Ecnerwal in sci.electronics.basics10 years ago 7 replies

When I go looking for information on crystal filters, everything I can find seems to be aimed at using a bunch of crystals and capacitors to...

When I go looking for information on crystal filters, everything I can find seems to be aimed at using a bunch of crystals and capacitors to widen the bandwidth, or else it's marketing for people who would be happy to sell me crystal filters of the above sort. I don't want to widen the bandwidth... What I'm presently interested in is an exceedingly narrow-band filter and/or amplifier....


Crystal Radio Tuning Capacitor

Started by Dave.H in sci.electronics.basics10 years ago 15 replies

I'm planning to build a crystal radio similar to the one linked to at the bottom of this post, but the specs call for a 30-160 pf...

I'm planning to build a crystal radio similar to the one linked to at the bottom of this post, but the specs call for a 30-160 pf tuning capacitor, all I can find is a 60-160 pf cap. Will this still work?


2 Transistor AM Radio

Started by Dave.H in sci.electronics.basics10 years ago 19 replies

Not sure if this is the correct place to ask, but here goes... I've found plans for a simple two transistor AM radio receiver, but I'm not sure...

Not sure if this is the correct place to ask, but here goes... I've found plans for a simple two transistor AM radio receiver, but I'm not sure how the ferrite loop antenna is connected to the radio. I'm not at all good with schematics, I can understand most of it except for the ferrite antenna bit. I would appreciate any help on this. http://www.techlib.com/electronics/crystal.html#Simp...


Questions About Construction Of The Australian Mystery Crystal Set

Started by Dave.H in sci.electronics.basics10 years ago 20 replies

I've been looking at a number of simple crystal radio designs, and I've found the Australian mystery crystal set, and am interested in building...

I've been looking at a number of simple crystal radio designs, and I've found the Australian mystery crystal set, and am interested in building that, mainly because it's an Australian design, and I've heard it it's a pretty good performer. I only have 2 questions- can I substitute the detector for a 1N34? and what is double silk covered wire and do I really have use that? What's wrong with ...


Crystal Radio Amplifier

Started by Dave.H in sci.electronics.basics9 years ago 7 replies

This may be a stupid question, but I'm about to build a crystal radio (http://www.bobsdata.com/crystal_radio/index.html) and I want to use...

This may be a stupid question, but I'm about to build a crystal radio (http://www.bobsdata.com/crystal_radio/index.html) and I want to use a little audio amp (Cat. KC5152 @ www.jaycar.com.au), and was wondering if I'd need the matching preamp (Cat. KC5172 @ Jaycar) for the crystal radio's high impedance output. Any help on this appreciated. Thanks, Dave


Crystal Radio Questions

Started by Joe in sci.electronics.basics8 years ago 10 replies

I'm winding a coil for a crystal radio. The original plan says to wind the antenna coil on top of the tuning coil, whereas another version...

I'm winding a coil for a crystal radio. The original plan says to wind the antenna coil on top of the tuning coil, whereas another version says to wind the antenna coil *adjacent* to the tuning coil, separated by about 1/4 inch. If I wind both versions of the antenna coil on the form, will one winding interfere with the other? That is, I would only hook up one antenna coil at a time, so ...


Why does crystal oscillator run slow?

Started by Bill Bowden in sci.electronics.basics7 years ago 22 replies

I have an old 30KHz crystal in a big can that measures about 1.5 inch by 5/8 and hooked it up with a couple logic gates as an oscillator and the...

I have an old 30KHz crystal in a big can that measures about 1.5 inch by 5/8 and hooked it up with a couple logic gates as an oscillator and the frequency is just about right at 30Khz. Then I tried to make an oscillator using a couple transistors as inverters with a little bias to get it going on a 1.5 volt battery, but the frequency is lower at 29.9982 Khz. The second inverter has a 5.6K ...


Minature AM transmitters - attenuation?

Started by naked_draughtsman in sci.electronics.basics6 years ago 11 replies

Hello I'm building a remote control circuit using some miniature AM transmitters/receivers. This is my first RF project (apart from making...

Hello I'm building a remote control circuit using some miniature AM transmitters/receivers. This is my first RF project (apart from making crystal radio sets when I was younger). The transmitter I'm using is one of these: http://uk.farnell.com/quasar/qam-tx1/module-transmitter-am-433mhz/dp/1304024 They are pretty basic - they need power, a data input and an aerial. They are quoted as h...


Crystals Oscillators and Usage

Started by Zv_oDD in sci.electronics.basics6 years ago 4 replies

So I'm playing with a AVR PiC, the ATMEGA32. And its needs 16mhz crystal hooked to it like so: http://tinypic.com/r/ei9im9/5 Note; I used a...

So I'm playing with a AVR PiC, the ATMEGA32. And its needs 16mhz crystal hooked to it like so: http://tinypic.com/r/ei9im9/5 Note; I used a Cap and Inductor pair for the crystal symbol. I am just wondering what is the role of the capacitors? Can I use 1uf caps instead and still get 16Mhz?


Where to buy crystals?

Started by DaveC in sci.electronics.basics5 years ago 10 replies

I need a 2-pin crystal, 8.86723 (PAL video standard). Where do you get these now? Seems nobody carries them, not even ham radio shops. I'd...

I need a 2-pin crystal, 8.86723 (PAL video standard). Where do you get these now? Seems nobody carries them, not even ham radio shops. I'd visit a ham swap meet but I can't wait. I can get them from Ireland... Any sources in the States? Thanks. (I'm in N. California.)


Crystal load?

Started by DaveC in sci.electronics.basics5 years ago 11 replies

I'm ordering a 2-pin crystal (8.86723 MHz) and need to specify the load. A little help calculating this,...

I'm ordering a 2-pin crystal (8.86723 MHz) and need to specify the load. A little help calculating this, please? http://www.tinyuploads.com/images/yr8Paq.jpg Thanks!


Soldering newbie

Started by M. Hamed in sci.electronics.basics5 years ago 51 replies

I am not new to soldering. I have some soldering experience. I have built a= radio kit with no soldering problems whatsoever. I have made little...

I am not new to soldering. I have some soldering experience. I have built a= radio kit with no soldering problems whatsoever. I have made little boards= for things like transistor amplifiers for my crystal radio. I have little = surface mount experience, but in a moment of extreme courage, my boss let m= e rework about 50 PCBs at once when he was on vacation. That involved solde= ring a lit...


Faux MOSFET... Behavioral Modeling

Started by Jim Thompson in sci.electronics.basics4 years ago 5 replies

For sometime now I have been trying to build a behavioral model of logic gates that was consistent with real-world behavior when mixed into an...

For sometime now I have been trying to build a behavioral model of logic gates that was consistent with real-world behavior when mixed into an Analog environment. (Existing logic models, such as those in PSpice and LTspice are state machines and do not behave properly when used for Analog applications, such as when you build a crystal oscillator around a 74HCU04.) So I now invite you to ...


Critic of circuit before I build it.

Started by amdx in sci.electronics.basics3 years ago 21 replies

I'm about to build this circuit to compare output from different ferrite receive antennas. I will be using it with the the FET...

I'm about to build this circuit to compare output from different ferrite receive antennas. I will be using it with the the FET amplifier referenced at the bottom of the page, so the input impedance is not a concern. I'm mostly interested in the DC output to monitor signal levels. AM band frequencies. http://www.crystal-radio.eu/diodedetector/endiodedetector.htm Any fix for the si...