In this video I use the MAR-6 monolithic smplifier
https://www.minicircuits.com/pdfs/MAR-6+.pdf
and create a simple preamp using the following schematic
https://github.com/thaaraak/preamp-mar6/blob/master/preamp-mar6.pdf
I do a little bit of testing and then insert it into the Tayloe detector board I used in the earlier video
https://www.youtube.com/watch?v=prCrbD4T6I4&t=1s
0:00 Intro
0:23 Walkthrough of datasheet and application circuit
1:53 Walkthrough of physical device
2:44 Walkthrough of MAR-6 preamp board
3:56 Test setup and testing various frequency/amplitude combinations
7:32 How the preamp is connected to the Tayloe board
8:10 Preamp mounted on the board
9:21 Testing the audio output at various input amplitudes
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https://www.youtube.com/watch?v=-1QsXNWUM5o
In this video I show the method I use to produce PCBs using photosensitive dry film
Materials (no affilition for any)
Sodium Hydroxide (Lye) - ACE hardware
Sodium Carbonate (washing soda) - ACE Hardware
Photosensitive film - https://www.amazon.com/gp/product/B01NCS88LU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
UV LED lights - https://www.amazon.com/gp/product/B08MZQGZLT/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
Transparency - https://www.amazon.com/Samsill-Transparent-Projector-Transparency-Printers/dp/B07F45YXJD/ref=sr_1_5?keywords=samsill%2Btransparency&sr=8-5&th=1
Ferric Chloride etchant - https://www.amazon.com/gp/product/B008O9XMYA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
Copper board - https://www.ebay.com/itm/313742922377
Kicad - https://www.kicad.org/
Laminator - nothing special here as you don't need high heat - a simple Iron would do also
Laser Printer - Brother HL-2300D (ink jet wont work)
Old Picture Frame
0:00 Intros
1:29 Materials needed
5:28 The process in a nutshell
7:00 Printing the Transparencies
10:40 The transparencies
11:44 Doubling up the transparencies
12:00 Aligning transparencies front and back
13:11 Using an old picture frame to sandwich the board
14:12 Laminating the photosensitive dry film to the copper board
17:00 Exposing the board to UV
19:26 The exposed board - and removing the protective film
20:37 The sodium carbonate bath
23:45 Etching the board **** DANGER - PLEASE USE GOGGLES and GLOVES ****
24:23 The etched board
25:33 Removing the film with sodium hydroxide **** DANGER - PLEASE USE GOGGLES and GLOVES ****
27:00 The completed board
27:31 The completed board under the microscope
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https://www.youtube.com/watch?v=Q50hZpxnpME
In this video I create a board for the SDR I previously did in this video:
https://www.youtube.com/watch?v=prCrbD4T6I4&t=1s
The github repo containing the kicad files (and a PDF for those without kicad) is here
https://github.com/thaaraak/Tayloe-Mixer-v3
The QRP-Labs bandpass filter I mentioned is here:
https://qrp-labs.com/bpfkit.html
Mr Carlsons lab technique for double sided boards
https://www.youtube.com/watch?v=au2ba5gWLWk
My Earlier video using "fab in a box"
https://www.youtube.com/watch?v=X5O1au3FvRc
0:00 Intro and Board Walkthrough
1:37 Schematic walkthrough (apologies again for the low piched hum)
4:22 Build Order
6:18 Power supply circuitry on the board and tested
8:30 A problem with the RX/TX lines
9:50 RX/TX lines fixed
10:38 ESP32-A1S installed on the board
11:30 First program flashed
13:28 si5351 installed and tested
15:20 Wrap up
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https://www.youtube.com/watch?v=redvZ7LcXT0
This video describes the IF AMP and VFO construction
Correction: I mentioned in one of the earlier videos this was a 1970s kit. My mistake its an early 90s kit
MC1350 Datasheet: http://www.lansdale.com/datasheets/ml1350_reva.pdf
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https://www.youtube.com/watch?v=_d_pt1imnnU
In this video I do some playing around with the GPIO pins on a pi4.
My github repo
https://github.com/thaaraak/gpio
BCM2835 Library and Book
https://www.airspayce.com/mikem/bcm2835/
https://www.amazon.com/gp/product/1871962633/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
WiringPi
https://github.com/WiringPi/WiringPi
BCM2711 Datasheet
https://datasheets.raspberrypi.org/bcm2711/bcm2711-peripherals.pdf
Pi 4 GPIO Header layout
https://www.raspberrypi.org/documentation/usage/gpio/
My earlier MAX7219 example with STM
https://www.youtube.com/watch?v=m8SF6exYkSs&t=1508s
0:00 Intro
1:50 Pi hardware notes
2:20 GPIO Pins layout
6:02 Basic GPIO Access methods
9:46 The wiringPi and BCM2835 libraries
12:10 GPIO Output - Simple Blink Program
19:32 GPIO Input - Input processing
24:57 Raspberry Pi IoT book
25:31 I2C Example with ADS1115 ADC
35:00 SPI example with MAX7219 8 digit LED driver
41:22 Reading serial with a GPS receiver
43:13 Python serial example
44:28 C serial example with wiring Pi
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https://www.youtube.com/watch?v=JT6dtM1e2Jw
In this video I install the receive switch which completes this build series. I then test receive functionality
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https://www.youtube.com/watch?v=fkn2m39RLz8
I thought I do a video showing show experiments I have been doing for a 5W push pull style amplifier at 14 Mhz.
Charlie Morris has a great video explaining the math here
https://www.youtube.com/watch?v=CtyabG69d4g&t=1503s
The push/pull style amplifier is based on the Ensemble RXTX power amplifier described here
http://www.wb5rvz.org/ensemble_rxtx/10_pa
The ltspice circuit is on my github repo
https://github.com/thaaraak/ltspice
Note that the original ensemble amplifier sets the bias of the mosfets using a reference circuit which I did include in the ltspice model - but I used a simple 5V regulator in mine.
Here's the site that I used for the lowpass filter
https://rf-tools.com/lc-filter/
and the Toroid calculator is here
https://toroids.info/T37-6.php
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https://www.youtube.com/watch?v=efGYnsF4bDU