ravimarcus
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ravimarcus said:Hi Everyone,
There are many PICmicro programmer designs but 99% of them need a PC. Why don't we all join together and build a PICmicro ZIP socketed & ICS programmer / duplicator ?
Cheers
Ravi
ravimarcus said:Here's the final schematic with USB interface. Comments and feedback are welcome before proceeding to PCB design.
Cheers
Ravi
AddedVSMVDD said:usual problem people maybe give themselfs is to forget the series resistor between the bridge rectifier & main resoviour cap and the input to the regulator you must use one usual 20 or so ohms to limit the current or a spike can destroy the regulator anyway it will run warm if you dont
Here the VCC is directly not available on the connectors, hence I have removed it.also i always place a low value like .22 R safety resisitor in series with the regulator output as you use this vcc voltage everywhere and also it arrives on some output cables its a good idea
Donelcd should have a 47uf electrolytic on its vdd rail
In this application, there is not much of surge currents and spikes. Hence to keep the circuit simple, beeds and inductor has been avoided. Adding beeds and inductor is a good practice, but if the PCB layout useing these components is not good, then the whole idea of using beeds and inductor will be in waste.placing some ferrite beeds also is a good idea if your using flying leeds i place at least two 3mm ones on the input & output pin of the regulator package. if you use smd for the regtulator this isnt practicle so maybe then use a small value choke
Donealso the addition of a diode to the gnd pin of the regulator will increase its output by .6v this is handy for displays and leds etc as very often some voltage gets lost accross safety devices like series diodes
creative_35 said:Is it possible to use USART engine for transfering data from one PIC to another (Programming 16FXX from 16F87XA)
or I have to use bit banging?
I have another doubt abt hex files.
<snip>
Now the third portion(type of data=04) is always 00 in all lines except the end line where it's 01. In some old hex files we can not see this type of first line. I am confused on that 04. what does that mean? any idea? is it represent the starting of data? some dis assamblers can't identify this type of first line. another doubt is how the checksum being calculated?
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