When you think of Singer, you usually think of sewing machines, although if you are a history buff, you might remember they diversified into calculators, flight simulation, and a few other odd businesses for a while. [Techmoan] has an unusual device from Singer that is decidedly not a sewing machine. It is a 1970s-era multimedia briefcase called the Audio Study Mate. This odd beast, as you can see in the video below, was a cassette player that also included a 35mm filmstrip viewer. Multimedia 1970s-style!

The film strip viewer is a bright light and a glass screen with some optics. You have to focus the image, and then a button moves the film one frame. However, that’s for manual mode. However, the tape could encode a signal to automatically advance the frame. That didn’t work right away.

Luckily, that required a teardown of the unit to investigate. Inside was a lot of vintage tech, and at some point, the auto advance started working somewhat. It never fully worked, but for a decades-old electromechanical device, it did pretty well.

We do, sometimes, miss what you could pull off with 35mm film.

youtube.com/embed/d38vzTbevAg?…

hackaday.com/2025/05/15/not-a-…

As with all aging bodies, clogged tubes form an increasing issue. So too with the 47-year old Voyager 1 spacecraft and its hydrazine thrusters. Over the decades silicon dioxide from an aging rubber diaphragm in the fuel tank has been depositing on the inside of fuel tubes. By switching between primary, backup and trajectory thrusters the Voyager team has been managing this issue and kept the spacecraft oriented towards Earth. Now this team has performed another amazing feat by reviving the primary thrusters that had been deemed a loss since a heater failure back in 2004.

Unlike the backup thrusters, the trajectory thrusters do not provide roll control, so reviving the primary thrusters would buy the mission a precious Plan B if the backup thrusters were to fail. Back in 2004 engineers had determined that the heater failure was likely unfixable, but over twenty years later the team was willing to give it another shot. Analyzing the original failure data indicated that a glitch in the heater control circuit was likely to blame, so they might actually still work fine.

To test this theory, the team remotely jiggled the heater controls, enabled the primary thrusters and waited for the spacecraft’s star tracker to drift off course so that the thrusters would be engaged by the board computer. Making this extra exciting was scheduled maintenance on the Deep Space Network coming up in a matter of weeks, which would troubleshooting impossible for months.

To their relief the changes appears to have worked, with the heaters clearly working again, as are the primary thrusters. With this fix in place, it seems that Voyager 1 will be with us for a while longer, even as we face the inevitable end to the amazing Voyager program.

hackaday.com/2025/05/15/voyage…

The drivetrain of most modern bicycles has remained relatively unchanged for nearly a century. There have been marginal upgrades here and there like electronic shifting but you’ll still mostly see a chain with a derailleur or two. [Matthew] is taking a swing at a major upgrade to this system by replacing the front derailleur with a torque converter, essentially adding an automatic transmission to his bicycle.

Most of us will come across a torque converter in passenger vehicles with automatic transmissions, but these use fluid coupling. [Matthew] has come up with a clever design that uses mechanical coupling instead using a ratchet and pawl mechanism. There are two gear ratios here, a 1:1 ratio like a normal bicycle crank and a 1.5:1 ratio that is automatically engaged if enough torque is applied to the pedals. This means that if a cyclist encounters a hill, the gear automatically shifts down to an easier gear and then will shift back once the strenuous section is finished.

[Matthew] machined all the parts for this build from scratch, and the heavy-duty solid metal parts are both impressive but also show why drivetrains like this haven’t caught on in the larger bicycling world since they’re so heavy. There have been some upgrades in internally geared hubs lately though, which do have a number advantages over traditional chain and derailleur-based bikes with the notable downside of high cost, and there have been some other interesting developments as well like this folding mechanical drivetrain and this all-electric one.

youtube.com/embed/cMhvfIiR5gs?…

Thanks to [Keith] for the tip!

hackaday.com/2025/05/15/automa…

Once a printed circuit board (PCB) has been assembled it’s rather hard to look inside of it, which can be problematic when you have e.g. a multilayer PCB of an (old) system that you really would like to dissect to take a look at the copper layers and other details that may be hidden inside, such as Easter eggs on inner layers. [Lorentio Brodeso]’s ‘LACED’ project offers one such method, using both chemical etching and a 5 Watt diode engraving laser to remove the soldermask, copper and FR4 fiberglass layers.

This project uses sodium hydroxide (NaOH) to dissolve the solder mask, followed by hydrogen chloride (HCl) and hydrogen peroxide (H₂O₂) to dissolve the copper in each layer. The engraving laser is used for the removing of the FR4 material. Despite the ‘LACED’ acronym standing for Laser-Controlled Etching and Delayering, the chemical method(s) and laser steps are performed independently from each other.

This makes it in a way a variation on the more traditional CNC-based method, as demonstrated by [mikeselectricstuff] (as shown in the top image) back in 2016, alongside the detailed setup video of how a multi-layer PCB was peeled back with enough resolution to make out each successive copper and fiberglass layer.

The term ‘laser-assisted etching’ is generally used for e.g. glass etching with HF or KOH in combination with a femtosecond laser to realize high-resolution optical features, ‘selective laser etching’ where the etchant is assisted by the laser-affected material, or the related laser-induced etching of hard & brittle materials. Beyond these there is a whole world of laser-induced or laser-activated etching or functionalized methods, all of which require that the chemical- and laser-based steps are used in unison.

Aside from this, the use of chemicals to etch away soldermask and copper does of course leave one with a similar messy clean-up as when etching new PCBs, but it can provide more control due to the selective etching, as a CNC’s carbide bit will just as happily chew through FR4 as copper. When reverse-engineering a PCB you will have to pick whatever method works best for you.

Top image: Exposed inner copper on multilayer PCB. (Credit: mikeselectricstuff, YouTube)

hackaday.com/2025/05/15/laced-…

Vi segnalo questo podcast in cui se n'è parlato:

Lo trovate un po' su tutte le piattaforme, compreso su Antenna Pod.

In particolare, si spiega perché il testo legato alla raccolta firme che sta girando non è accurato.

open.spotify.com/episode/2QAdk…

#MatrimonioEgualitario #matrimonio #diritti #EQUITA #referendum #gaymarriage #samesexmarriage #Matrimoniogay #lgbtquia #lgbt #italia #repubblicadellebanane

Un nuovo referendum in vista

Closer · Episode

^{Un nuovo referendum in vista (Spotify)}

E' stata denominata “Petrolio dorato” l’operazione dei carabinieri che ha condotto ad arresti e perquisizioni - non solo in Italia - su mandato del gip di Bologna, consentendo di scoprire un sistema illegale di commercio di oli vegetali esausti utili per produrre biodiesel.

Nell’ambito delle attività, i Carabinieri del Gruppo per la tutela ambientale e la sicurezza energetica di Venezia, con il supporto di diversi reparti dell’Arma, sono stati coordinati dalla Procura della Repubblica – Direzione distrettuale antimafia e antiterrorismo – di Bologna.

L’inchiesta ha consentito di documentare l’operatività di un sodalizio che, attraverso società autorizzate alla raccolta di oli vegetali esausti, traeva ingiusti profitti dagli introiti derivanti dal trattamento e dalla rivendita di questo rifiuto pregiato, utilizzato per la produzione del biodiesel. Attualmente sono iscritte nel registro degli indagati 22 persone e 2 società, a vario titolo ritenute responsabili dei reati di associazione a delinquere, attività organizzate per il traffico illecito di rifiuti, favoreggiamento personale, falsità ideologica commessa dal privato in atto pubblico e abuso d’ufficio, in relazione ai fatti accertati in Emilia-Romagna, Veneto, Trentino Alto-Adige e Campania nel periodo 2021 – 2022.

L’indagine ha visto il coinvolgimento nelle varie fasi di Europol per quanto riguarda la cooperazione internazionale di polizia, visto che gli indagati risultano gestire attività economiche anche in Grecia e Spagna, nonché commerciare con Austria, Belgio, Ungheria, Bulgaria, Repubblica Slovacca, Malta e Libia.

Accogliendo le richieste del Pm, il Gip ha disposto la misura cautelare nei confronti di 11 indagati (5 dei quali agli arresti domiciliari, 3 con obbligo di dimora e 3 con divieto di esercitare imprese o uffici direttivi in società del settore della gestione dei rifiuti) e il sequestro preventivo dei compendi societari e delle strutture aziendali delle due società al centro delle investigazioni. Nel corso dell’operazione verranno anche eseguite 17 perquisizioni personali e locali e svolte ispezioni ambientali a impianti di raccolta, gestione e trattamento di oli vegetali esausti.

#Armadeicarabinieri #carabinierinoe #carabinieritase #biodiesel #olivegetaliesausti #ambiente #europol

@Ambiente