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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

LDR Pre MkII - LDR volume control and I/O switching
LDR Pre MkII - LDR volume control and I/O switching
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Old 10th June 2019, 02:58 AM   #131
sabre66 is online now sabre66  Canada
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Join Date: Oct 2008
Hi I am really interested in this in this setup but is there a schematic? I cannot seem to find one. Also I presume R+ D+ and A+ are the three 5VDC that you mention in the first post.
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Old 10th June 2019, 03:04 AM   #132
rbalu72 is offline rbalu72  India
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Quote:
Originally Posted by sabre66 View Post
Hi I am really interested in this in this setup but is there a schematic? I cannot seem to find one. Also I presume R+ D+ and A+ are the three 5VDC that you mention in the first post.
Unfortunately No schematic available....

Read post 1 and subsequent thread. ZDR developed this version direct on a PCB. This requires a nano board with specific chip and lot of customisations at hw/sw applied to it. Dont think you can take up this as a diy project from ground up without the modded nano/firmware and pcb with circuit.

Send him a PM for any available PCBs/Kits...
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Old 10th June 2019, 03:12 AM   #133
sabre66 is online now sabre66  Canada
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Quote:
Originally Posted by rbalu72 View Post
Unfortunately No schematic available....

Read post 1 and subsequent thread. ZDR developed this version direct on a PCB. This requires a nano board with specific chip and lot of customisations at hw/sw applied to it. Dont think you can take up this as a diy project from ground up without the modded nano/firmware and pcb with circuit.

Send him a PM for any available PCBs/Kits...
Thanks for the reply I do plan on ordering the kit ASAP just filling in parts needed with digikey.
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Old 10th June 2019, 03:51 PM   #134
maal is offline maal  Poland
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Join Date: May 2005
Location: Lublin
Hi,

I added control over the wifi network to the preamp using the ESP-01 module (ESP8266).
The software running on ESP emulates the voltages sent by the TSOP34438 receiving signals from the the Apple Remote.
ESP generates voltages on pin GPIO2 (connected to the data pin of TSOP34438).
The ESP module connects to the WIFI network and listens to commands on port 80.


Example of sending "PLAY" button over the IP network (here from linux):

Code:
$ echo "p" | nc -n <ESP_IP_ADDRESS> 80 -q 0


Connections:


3.3V PSU ______ ESP-01

3.3V <------------> VCC
3.3V <------------> CH_EN
GND <------------> GND



ESP-01 __________ TSOP34438

GPIO2 <------------> DATA
GND <--------------> GND


Source code (for the Arduino IDE) in the attachment.
Attached Files
File Type: txt ldr_pre_mkii_wifi.ino.txt (5.9 KB, 12 views)
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Old 11th June 2019, 07:02 AM   #135
zdr is offline zdr  Belgium
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Location: Brussels, Beograd
Quote:
Originally Posted by maal View Post
Hi,

I added control over the wifi network to the preamp using the ESP-01 module (ESP8266).
The software running on ESP emulates the voltages sent by the TSOP34438 receiving signals from the the Apple Remote.
ESP generates voltages on pin GPIO2 (connected to the data pin of TSOP34438).
The ESP module connects to the WIFI network and listens to commands on port 80.


Example of sending "PLAY" button over the IP network (here from linux):

Code:
$ echo "p" | nc -n <ESP_IP_ADDRESS> 80 -q 0


Connections:


3.3V PSU ______ ESP-01

3.3V <------------> VCC
3.3V <------------> CH_EN
GND <------------> GND



ESP-01 __________ TSOP34438

GPIO2 <------------> DATA
GND <--------------> GND


Source code (for the Arduino IDE) in the attachment.
Nice!
__________________
Custom PCBs, BOM and LDR Firmware:
https://sites.google.com/view/dacgear/
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Old 13th June 2019, 08:41 PM   #136
streetpreacher is offline streetpreacher
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Join Date: Apr 2019
Already assembled, now lets test and correct any mistake I made.
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Old 14th June 2019, 09:19 AM   #137
streetpreacher is offline streetpreacher
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Join Date: Apr 2019
Need some help.
After everything assembled Iīm having error 20.
No voltage on any of the 3 relays near LDR, but if I give them 5v directly they operate.
If I try to set bias, measure the ldr and try to calibrate it stop on step 19.
Sorry but, please can you tell me how to debug this to try to solve the problem.
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Old 14th June 2019, 12:05 PM   #138
zdr is offline zdr  Belgium
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Location: Brussels, Beograd
First of all, if you are getting any error at boot, this has to be cleared first as nothing else will work if errors are present. I have included a way to go around this error simply to allow to browse the setup menu and do measurements in different modes for troubleshooting purposes.

Three relays on the side are particularly critical as they are calibration relays. If you have no power on them, then you probably donít have power on any of the relays as they are on the same power line. DC issues are easy to trace, just follow the voltage from R+ dc input.
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Custom PCBs, BOM and LDR Firmware:
https://sites.google.com/view/dacgear/
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Old 14th June 2019, 02:03 PM   #139
streetpreacher is offline streetpreacher
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Join Date: Apr 2019
The ULN2003 was erratic, new one and everything is running perfectly.
Thanks ZDR for all
My brother is amazed for this design, probably one more client for the board
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Old 17th June 2019, 05:42 PM   #140
ernesternest is offline ernesternest  Europe
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Location: Cologne
LDR Pre MkII - LDR volume control and I/O switching
Default arduino

Hi Neb, I finished my build yesterday and tried to power it up today. I have the 1602 display and it showed just squares plus some strange letters or numbers. After a while letters stopped and there were just white squares.
I switched off the thing and reswitched it. Nothing at all.

Tried to flash the arduino, since I thought there might be something wrong. Followed your proposal but was not successful. Program found Arduino but couldn't connect to it. The system tried to connect for 10 times, then stopped. Strange. So I think I killed it with anything. Any idea?

I ordered a few of them for a new try.

Cheers,

Ernst
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