Contributions of the group Electronics

CNV00004

nobody@ipernity.com (SV1XV) — Thu, 22 Jun 2017 05:06:16 +0000

SV1XV has posted:

Inside Heathkit Aircraft Navigation Computer, photo by Tony Duell uploaded to Flickr! under a CC-BY-2.0 free license.

Flickr image: www.flickr.com/photos/tony_duell/4034706704

This work is licensed under a Creative Commons Attribution 4.0 International License.

CNV00002

nobody@ipernity.com (SV1XV) — Thu, 22 Jun 2017 05:06:22 +0000

SV1XV has posted:

Heathkit Aircraft Navigation Computer, photo by Tony Duell uploaded to Flickr! under a CC-BY-2.0 free license.

Flickr image: www.flickr.com/photos/tony_duell/4033952421

Short URL: flic.kr/p/79t4vP

This work is licensed under a Creative Commons Attribution 4.0 International License.

CNV00005

nobody@ipernity.com (SV1XV) — Thu, 22 Jun 2017 05:11:02 +0000

SV1XV has posted:

Aircraft Navigation Computer PCB component side. 3 mask-programmed microcontrollers! , photo by Tony Duell uploaded to Flickr! under a CC-BY-2.0 free license.

Flickr image: www.flickr.com/photos/tony_duell/4033951835

This work is licensed under a Creative Commons Attribution 4.0 International License.

QRP Labs Transceiver Board

nobody@ipernity.com (SV1XV) — Sat, 19 Sep 2026 14:10:11 +0000

SV1XV has posted:

A close look at a QRP Labs Rev 3 transceiver board, with hand-wound toroidal inductors, film capacitors, and through-hole components — a ham radio QRP kit build. Photograph by photo516 uploaded on Flickr under a Creative Commons CC BY-NC-ND-2.0 license.

Flickr file: www.flickr.com/photos/ejwettstein/52243135786

Short URL: flic.kr/p/2nAxJ9s

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 2.0 International License.

199604Connie0004

nobody@ipernity.com (GrahamH) — Fri, 23 Jul 2010 13:08:25 +0000

GrahamH has posted:

Connie at Tamworth for circuit / touch and go practice in April 1996.

nixie tubes

nobody@ipernity.com (SV1XV) — Mon, 09 Oct 2017 13:55:58 +0000

SV1XV has posted:

Nixie tubes of a Casio AS-8E calculator. Macro photo by Serban Dumitrescu, uploaded on Flickr under a non-commercial CC-BY-NC-SA license.

Flickr file: www.flickr.com/photos/doomy/37552901772

Short URL: flic.kr/p/ZdqrnE

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 International License.

U30 B battery

nobody@ipernity.com (SV1XV) — Tue, 20 Feb 2024 05:49:27 +0000

SV1XV has posted:

Two vintage Burgess Radio B batteries, type U30, 45 Volts, made in the United States, circa 1950s. Photograph by Joe Haupt, uploaded on Flickr under a Creative Commons CC-BY-SA-2.0 free license.

Flickr file: www.flickr.com/photos/51764518@N02/53540115028

Short URL: flic.kr/p/2pza5Tw

This work is licensed under a Creative Commons Attribution-ShareAlike 2.0 International License.

Sound Sensor Module 1PC

nobody@ipernity.com (Ninfea) — Mon, 08 Jan 2024 16:08:22 +0000

Ninfea has posted:

...für Macro Mondays am 08. Januar 2024
...elektronisches Bauteil...

Microcontroller board

nobody@ipernity.com (SV1XV) — Wed, 08 Nov 2023 10:37:00 +0000

SV1XV has posted:

A microcontroller board with three Arm CORTEX M0+ μCUs (hidden under the LCD display) for escallator safety functions. (20231103_144955)

This work is licensed under a Creative Commons Attribution 4.0 International License.

Hallicrafters S-108

nobody@ipernity.com (SV1XV) — Tue, 19 Sep 2023 14:04:42 +0000

SV1XV has posted:

Vintage Hallicrafters model S-108 receiver, broadcast band plus three shortwave bands and bandspread on 5 amateur radio bands, 8 tubes, metal cabinet. Made In USA, circa 1959 - 1965 (Auction Item 247). Photograph by Joe Haupt uploaded on Flickr under a CC-BY-SA-2.0 free license.

Flickr file: www.flickr.com/photos/51764518@N02/26372620010

Short URL: flic.kr/p/Gbsz81

This work is licensed under a Creative Commons Attribution-ShareAlike 2.0 International License.

Out with the old, in with the new

nobody@ipernity.com (John Sheldon) — Sat, 12 Aug 2023 10:31:07 +0000

John Sheldon has posted:

In 2015 I built a computer for photo processing. It is still in use (for PC games) 8 years later.
Over the years, it has had a new graphics card, an internet adapter, upgraded memory and an extra fan; also it needed a replacement PSU (power supply unit); and now in order to replace Windows 8.1 with Windows 11 it has had a new motherboard (main board), a new CPU (central processing unit) and the SSD (solid state drive) has been replaced with a bigger PCIe style SSD; oh, and the memory has been doubled again.
However, it is good to know that the computer is still in use after all this time.
(I have in mind here the Wikipedia article called ‘Ship of Thesius’. The concept is also known popularly in the UK as ‘Trigger’s broom’).

Takumar-A 28mm f2.8 vintage lens.

Lafayette HE-30

nobody@ipernity.com (SV1XV) — Sun, 18 Jan 2015 09:51:04 +0000

SV1XV has posted:

A Lafayette HE-30 HF receiver, at the permanent exhibition of the Radio Amateur Association of Greece. (DSCN0077)

This work is licensed under a Creative Commons Attribution 4.0 International License.

First_bipolar_transistor (1947)

nobody@ipernity.com (SV1XV) — Mon, 19 Jan 2015 11:27:33 +0000

SV1XV has posted:

Replica of Bell Labs transistor (1947). In 1997 Lucent Technologies created this replica to commemorate the 50th anniversary of the invention of the point-contact transistor at Bell Labs in December 1947.

Flickr! image by Revol Web.

Flickr file: www.flickr.com/photos/38671911@N08/3984348493

Also on Wikimedia Commons: commons.wikimedia.org/wiki/File:Replica-of-first-transistor.jpg

This work is licensed under a Creative Commons Attribution-ShareAlike 2.0 International License.

Bench Computer PS No 2 002

nobody@ipernity.com (GrahamH) — Wed, 23 Jan 2013 09:58:41 +0000

GrahamH has posted:

An old nearly ATX power supply set up for use as a bench supply. This needed a load on the +5V rail for the supply to operate. Instead of a resistor I used a 12V 10W auto lamp which doubles as pilot lamp. I have yet to fit a DC switch, the green switch wire is earthed till then. See note on www.ipernity.com/doc/grahamh/23993553/in/album/463841.

Train Radio Dwg0001

nobody@ipernity.com (GrahamH) — Thu, 22 Dec 2011 03:40:50 +0000

GrahamH has posted:

General overview of the terrestrial side of the Train Radio system as built. This shows whether the radio base site was greenfield (1), used an existing building with a new mast (2) or used an existing radiocomms site (3). The type of linking, usually via a node, to the relevant train control location.

View using this link to read details.
www.ipernity.com/doc/grahamh/24117033/sizes/2048

See some of the sites using this link.
www.ipernity.com/doc/grahamh/album/466749?with=24117033 or search using the Ipernity search box for 'countrynet'

Repair Amplifier 20220818 14 42 20 Pro

nobody@ipernity.com (GrahamH) — Mon, 17 Apr 2023 11:24:49 +0000

GrahamH has posted:

This is one of three amplifiers at the church I go to. I was gathering interconnection information for the whole system so I could make changes to improve reliability in Toowoomba's summer thunderstorm season when I found this had stopped working. I removed it from the equipment rack and took off the cover. There was nothing obvious except the blown fuse in the mains power socket. This photo was taken then. I replaced the cover and took it home for further investigation.

At home I eventually decided that the mains power transformer, the circular object with the wires going from it, was probably faulty. I contacted the Australian agent of the manufacturer, Bosch, for circuit diagrams and technical information. They weren't very helpful but did refer me to a business which did warranty repairs for this type of product. The service manager answered some general questions but didn't/wouldn't supply any circuit information. I worked out a likely AC supply voltage but didn't anything on hand to provide it to check that the rest of the amplifier was working correctly. I ordered a replacement transformer anyway with some trepidation. A pleasant surprise was that it was priced comparably with the normal pricing for similar transformers.

About a month later the transformer arrived. With the aid of some photos, a soldering iron and some other tools I replaced the transformer and was relieved when the amplifier then worked correctly. I measured a few key voltages and wrote them on the chassis in case there was any further trouble. The amplifier worked correctly when reinstalled in the rack at church.

Mouse-over to see some other photos of the amplifier.

199406TrainRadioSwitchon0005

nobody@ipernity.com (GrahamH) — Sat, 13 Feb 2010 06:34:58 +0000

GrahamH has posted:

Railmotor HPC402 was held in the dock platform at the north end of Orange station. It ran various trips towards Dubbo to test the Train Radio. An interior view showing it being readied for testing. June 1994.

Connections 20220719 16 09 52 Pro

nobody@ipernity.com (GrahamH) — Wed, 29 Mar 2023 04:17:56 +0000

GrahamH has posted:

A connections point which parallels sound board input cables from another bank of 4 inputs at my church. This was done to improve operating flexibility. July 2022.

Distribution Box 20220303 15 42 44 Pro

nobody@ipernity.com (GrahamH) — Sun, 19 Mar 2023 06:49:24 +0000

GrahamH has posted:

A circuit I built in early 2021 to take a mono unbalanced audio signal at line level from a sound desk, isolate it and provide two pseudo stereo feeds to different devices and a headphone monitoring point. The 4 connections are 6.5mm phone sockets. This was used in enabling church services to be sent over the Web on a conference program. Mouse over for more info. March 2022.

Switch Box 20220303 15 33 09 Pro

nobody@ipernity.com (GrahamH) — Sun, 19 Mar 2023 06:38:52 +0000

GrahamH has posted:

A switch box I built to send unbalanced stereo sound at line level to two alternate devices. March 202.