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 21 
 on: March 16, 2019, 04:36:09 16:36 
Started by DreamCat - Last post by token0
TI is known for their strict policy layers, lot of NDA, even separate offices in outsourcing contractors.

 22 
 on: March 14, 2019, 06:11:22 18:11 
Started by sadman - Last post by thunderer
Not to be the bearer of bad news, but the russian "addition" does not do any Digital Control.

The so called "Digital Control" only reads the voltage and the current, displays it on a 16x2 LCD and probably (I cannot tell only by looking at the russian schematic) cuts the output if overload occurs.

There are options to do digitally controlled power supplies by implementing a DC/DC (like my PSU based on TL494 and 12 bit DACs), but also linear options may be implemented with digipots (careful on the max current that can pass through the digipot).

 23 
 on: March 14, 2019, 05:58:33 17:58 
Started by max - Last post by thunderer
I know it may be late, but give a chance to the Microchip MCP41HVx1 digipots. They work flawlessly.

 24 
 on: March 12, 2019, 03:32:16 15:32 
Started by sadman - Last post by max
Hi sadman

there is a relay control block diagram to select the secondary winding of the transformer,
do you have the sch for this block?

Regards

 25 
 on: March 12, 2019, 10:59:45 10:59 
Started by sadman - Last post by Wizpic
I think most of the newer K2700 projects are based on info from this book(link included not my own but checked out) But by all means start a new thread for a K2700 project
There is someone selling the bare PCB on e-bay and funny enough itís my drawings and the one on 320v.com, years ago I copied and laid out the pcb for it,the one on 320volt.com is my case drawing too I know itís mine because itís got smart designs on pcb lol, itís a good power supply

 26 
 on: March 12, 2019, 09:56:00 09:56 
Started by sadman - Last post by Sideshow Bob
Hi Wizpic

I will never take your comment as negative as comments always open up new possibilities and ideas I have the whole design and build instruction of K7200 power supply based on LM723 using two pair one for current control and one for voltage.
I think most of the newer K2700 projects are based on info from this book(link included not my own but checked out) But by all means start a new thread for a K2700 project

 27 
 on: March 12, 2019, 12:37:51 00:37 
Started by pushycat - Last post by pushycat
Surveillance camera based on Raspi Cam and Android Aap (EFY Feb 2017)
This project describes how to build a surveillance camera based on Raspberry Pi (Raspi) that records HD video only when something moves in the monitored area. Live feed can be viewed from any Web, including one on a mobile phone. Security cameras are common in most industries around the world. Their applications can range from preventing theft or vandalism to traffic and weather monitoring and much more. Due to a small form factor, affordable price and low power consumption, Raspberry Pi can be easily integrated in a surveillance camera. In this project we will first connect Raspi camera to Raspi, and stream live video from it. We can also watch the streaming of content from our Android device. We will also take photographs with different effects. Raspi is a credit-card-sized low cost microcomputer that can run Linux operating system, and has endless extension possibilities.

Links are exclusively for Sonsivri members. Thus links are uploaded as attachment. Please do not share links in open forum

 28 
 on: March 11, 2019, 10:22:43 22:22 
Started by sadman - Last post by sadman
I built this PSU some years ago, Based on the same design as the links you posted. I did have some problems with it, If you read pages and pages over on the electronics lab forum, One topic is 94 pages long.

In my opinion the design is not very good or reliable, I found that it worked but after some testing I found that the current limit side did not work if I remember correctly, I was not really happy with it so I stopped using it and threw it in the bin in the end even tough I paid little extra for the TLE2141 op-amps and carried out all the mod's but still no joy.

Sorry don't mean to be negative, Good share for people who want to build it on a budget and some people may disagree with me. From reading through most of the comments there is lots of people having issues  and Audioguru has answered everyone or someone tries to change the design.


Makes you wonder if the Elektor are selling that supply with the TLE2141 op-amps with that kit as it only cost 11 euro's ?

Those op-amps cost me round about £6 GBP for the 3.
The digital readout looks ok, But I would rather build my own using a 16bit ADC with a TFT display or a GLD with bigger fonts .
One of the best power supplies I've built was based on the veleman K7200 which they discontinued  Sad

Well that's my 2 pennies worth  

Hi Wizpic

I will never take your comment as negative as comments always open up new possibilities and ideas I have the whole design and build instruction of K7200 power supply based on LM723 using two pair one for current control and one for voltage.

I build that for 2 Amp current only as for hobby level you never need current over 2 amp personally I like mix mode power supply switching regulator for pre regulation and linear regulator for output Which will allow good control of heat dissipation (made that supply using LM2596 and LM338) with CC , CV function if member interested I will share K7200 build info here.

sadman

 29 
 on: March 11, 2019, 06:34:33 18:34 
Started by sadman - Last post by Wizpic
I built this PSU some years ago, Based on the same design as the links you posted. I did have some problems with it, If you read pages and pages over on the electronics lab forum, One topic is 94 pages long.

In my opinion the design is not very good or reliable, I found that it worked but after some testing I found that the current limit side did not work if I remember correctly, I was not really happy with it so I stopped using it and threw it in the bin in the end even tough I paid little extra for the TLE2141 op-amps and carried out all the mod's but still no joy.

Sorry don't mean to be negative, Good share for people who want to build it on a budget and some people may disagree with me. From reading through most of the comments there is lots of people having issues  and Audioguru has answered everyone or someone tries to change the design.


Makes you wonder if the Elektor are selling that supply with the TLE2141 op-amps with that kit as it only cost 11 euro's ?

Those op-amps cost me round about £6 GBP for the 3.
The digital readout looks ok, But I would rather build my own using a 16bit ADC with a TFT display or a GLD with bigger fonts .
One of the best power supplies I've built was based on the veleman K7200 which they discontinued  Sad

Well that's my 2 pennies worth  

 30 
 on: March 11, 2019, 11:52:43 11:52 
Started by sadman - Last post by sadman
Elektor is selling same kit from banggood which is also have same bug as banggood and electronics lab circuit Audioguru modified the circuit which is much better and work as expected he did a great job complete discussion is here.

https://www.eevblog.com/forum/beginners/bangood-psu-enhancements/

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