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...


Easy Prog

Started by lerameur in sci.electronics.basics11 years ago 1 reply

hello, i just bought the easyProg board from http://www.embedinc.com/easyprog/ I bought the PCB board from thm and ordered the parts form...

hello, i just bought the easyProg board from http://www.embedinc.com/easyprog/ I bought the PCB board from thm and ordered the parts form digikey but I had many parts here. The circuit voltage seems to corespond to the data sheets of embedinc. My problem is the oscillation, I and no 20Mhz oscillation. I took the chip Pic16F648 and put itin a bread board with a 20Mhz crystal, capacitor ...


4-pin Crystal

Started by Hoi Wong in sci.electronics.basics11 years ago 7 replies

I usually see crystals with 2-pins. Can anybody tell me what are the other legs for in 4-pin crystal oscillator packages? Thanks in...

I usually see crystals with 2-pins. Can anybody tell me what are the other legs for in 4-pin crystal oscillator packages? Thanks in advance. -- Hoi


crystal oscillator

Started by Anonymous in sci.electronics.basics11 years ago

Please suggest me how to estimate the motional capacitance of a crystal. The datasheet provided by the manufacturer generally...

Please suggest me how to estimate the motional capacitance of a crystal. The datasheet provided by the manufacturer generally contains information regarding ESR, parasitic cap and max load.


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.


PICs and Crystals

Started by Anonymous in sci.electronics.basics11 years ago 6 replies

Hello, I've got a PIC16F627 and two crystals. One is 12MHz, the other is 20MHz. The 12MHz one says it needs a load cap of 32pF, the 20MHz...

Hello, I've got a PIC16F627 and two crystals. One is 12MHz, the other is 20MHz. The 12MHz one says it needs a load cap of 32pF, the 20MHz one says it needs 30pF. What does this mean!?? The circuit in the PIC datasheet has two caps going from either side of the crystal to ground. Does that mean that these need to be 32pf each for the 12MHz and 30pf for the 20MHz? Also, it says a series...


crystal oscillating

Started by lerameur in sci.electronics.basics11 years ago 7 replies

Hello, I have a 2.0Mhz (2 pin ) crystal. I would liek to havr it oscillate so i can incorporate it inta a circuit. I tried puting one leg to...

Hello, I have a 2.0Mhz (2 pin ) crystal. I would liek to havr it oscillate so i can incorporate it inta a circuit. I tried puting one leg to Ground and the other to Vdd but nothing. How do i make it oscillate K


microchip design printer

Started by Anonymous in sci.electronics.basics11 years ago 9 replies

I was just wondering if it is possible to make a printer similar to an inkjet that prints microchip designs. It could print three types...

I was just wondering if it is possible to make a printer similar to an inkjet that prints microchip designs. It could print three types of pixels using three materials: conductive material - i.e. copper n-type material - i.e. silicon crystal doped with phosphorus p-type material - i.e. silicon crystal doped with boron A transistor would simply be an n pixel, p pixel, and n pixel adjacen...


Correct crystal oscillator choice.

Started by Anonymous in sci.electronics.basics10 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...


Source of piezo

Started by Jon Slaughter in sci.electronics.basics10 years ago 6 replies

I want to play around a little with the effects of piezo electric crystals but I'm weary of tearing up my clock's to get them(and the one I did...

I want to play around a little with the effects of piezo electric crystals but I'm weary of tearing up my clock's to get them(and the one I did tear up broke the crystal ;/) Is there any easy source for these(easy means quick and cheap)? Are these things very critical in handling or, say, could I just get some of these quartz crystals and break of piece and then play around with its ef...


VCXO frequency isn't high enough

Started by Anthony Fremont in sci.electronics.basics10 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...


Serial Wireless Transmission

Started by lewi...@googlemail.com in sci.electronics.basics10 years ago 2 replies

This is a bit of a n00b question but here goes: I need to transmit a signal (via radio signals) a reasonable distance 50m at the most but on...

This is a bit of a n00b question but here goes: I need to transmit a signal (via radio signals) a reasonable distance 50m at the most but on top of that I need to send many signals, one after the other... serially, ALSO in 8bit packets or something so that I can "address" them. Is all this possible with the use of some ICs, resistors and such and maybe a clock (crystal) for a reasonable ...


Motorola V8 housing,Motorola Q9 housing,Motorola MPX housing on sale

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...


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...


help w/testing oscope looking at variety of signals

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

I (hobbyist) was trying out the new (to me) oscope ( tek 2236 ) by trying a suggestion of looking at various waveforms from different equipment...

I (hobbyist) was trying out the new (to me) oscope ( tek 2236 ) by trying a suggestion of looking at various waveforms from different equipment around the house , clock radio/oscilators/crystals/wall-wart etc. i decided to crack open the $5 - 49.86 MHz remote control transmitter and sample the 49.86 MHz crystal and i was wondering what i should expect to see ? it appears to be (in ...


Re: question about microcontroler oscillator

Started by Pieter in sci.electronics.basics10 years ago 15 replies

On Wed, 31 Oct 2007 12:10:54 +0000, Eeyore wrote: > > > JW wrote: > > > Eeyore wrote > > > > > Can you provide an example of...

On Wed, 31 Oct 2007 12:10:54 +0000, Eeyore wrote: > > > JW wrote: > > > Eeyore wrote > > > > > Can you provide an example of any IC that has an internal crystal ? > > > > Sure: > > http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4984 > > Whilst the data sheet doesn't make it obvious, that's a HYBRID, not an IC. > > Graham > So what? The point is th


Re: question about microcontroler oscillator

Started by Pieter in sci.electronics.basics10 years ago 2 replies

On Wed, 31 Oct 2007 14:36:26 +0000, Eeyore wrote: > > > Pieter wrote: > > > Eeyore wrote: > > > JW wrote: > > > > Eeyore...

On Wed, 31 Oct 2007 14:36:26 +0000, Eeyore wrote: > > > Pieter wrote: > > > Eeyore wrote: > > > JW wrote: > > > > Eeyore wrote > > > > > > > > > Can you provide an example of any IC that has an internal crystal ? > > > > > > > > Sure: > > > > http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4984 > > > > > > Whilst the data sheet doesn't make it obvious, that's a


Re: question about microcontroler oscillator

Started by John Fields in sci.electronics.basics10 years ago 3 replies

On Wed, 31 Oct 2007 23:46:23 +0100, Pieter wrote: > On Wed, 31 Oct 2007 14:36:26 +0000, Eeyore > wrote: > > > > > > > Pieter...

On Wed, 31 Oct 2007 23:46:23 +0100, Pieter wrote: > On Wed, 31 Oct 2007 14:36:26 +0000, Eeyore > wrote: > > > > > > > Pieter wrote: > > > > > Eeyore wrote: > > > > JW wrote: > > > > > Eeyore wrote > > > > > > > > > > > Can you provide an example of any IC that has an internal crystal ? > > > > > > > > > > Sure: > > > > > http://www.maxi


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....