Collet Tool, part 1

Last time mentioned ordering cheap 8mm slot screw bits, 1.2mm thick. This to make my own SIFAM collet tool. Received the bits with a bit of delay, just before I left last weekend.
It is a small pack of 3 bits for €2.75 so one bit is about only 90 cents.

When unpacking, I was slightly alarmed by the claims ‘Extra Hard’ and ‘Made in Czech Republic’. So this actually might be very good quality, instead of the cheap and soft steel I had hoped for at this price...

Bosch 2 607 001 468 Extra Hard S8 bits

Tried a small needle file file on it, and can confirm it is really good steel.
Instead of using a lot of patience and elbow grease ordered a Proxxon Micromot 28 240 diamond coated grind bit (1.8mm) for about €3.49

Bit clampled in a small vice with red marker

Will try it in a drill at a high RPM setting and gradually mill a small indent, as marked inside the red region in this picture. If it fails, still can have two other tries.

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ADR modules part 1

This is a restoration project I’ve been procrastinating around since about 2015. This will be quite some work, but then if one doesn’t start at least it will not happen at all. This will be a step by step project, and see how far we get with this Kaizen like approach. So first a short intro of the four audio modules made by Audio & Design (Recording) Ltd, in the mid 70s based in Shinfield Green, Reading, Berkshire UK. The company still exists to this date and is still active in pro-audio and is now in a different location but still in Reading. These modules can be dated to the mid 1970s, more precisely found the E900 Equaliser unit quality checklists to be dated 12 November 1976. There are two E900 equaliser modules, and two F760N Compressor/Limiters. A picture of the now dismantled mixing desk with the four modules. The mixing desk was in a quite dusty and sorry state. The desk was too space consuming and heavy to keep and many other parts were sold as separate items. ...

ADR modules part 2, to recap or not?

Electrolytic capacitors have a wet dielectric which degrades with age and temperature. As a result the extremely thin oxide layers may become less isolating when stored over decades. Either the capacitor shorts or opens at some point, or just doesn't perform as good when it was new. Re-capping is the usual procedure to replace (all) electrolytic caps in restoring old audio equipment. The most common coupling capacitor value in these modules is 15uF / 40V. These smaller values might be replaceable with solid foil capacitors, though it largely depends on the space on the circuit board if this is possible and the cost involved. High-end audio nut cases (no relation to this blog) may spend top dollar/euro/yen on such things. Here it just has to be in line with the actual value of these units. So we will only use foil if the costs are limited. Otherwise just stick to cheap but good quality electrolytic caps. The likes of Nichicon, Panasonic, Vishay. Vishay bought a lot of the old Eur...

Humax 5000C HDMI repair.

This repair was a bit longer ago. I’m just posting this because of the lack of current projects. It might be worth sharing for anyone having the same problem. This DVB-C tuner had some picture output problems on the HDMI cable, especially when the connector was touched or wiggled a bit. (no or interrupting signal on the TV set) I suspected the HDMI receptacle to be a surface mount variant, and maybe problems with lead free solder . Such solder was a bit problematic when it first entered the market (and sometimes still gives issues). So I opened the case, and the connector seemed still an old through-hole style. (On the pciture right hand, just below the network jacks.) Humax 5000C with cover removed Solder time! Mainboard under inspection This was in my lunchbreak at work, so I can use the microscope to inspect the solder joints more close by. Unfortunately don’t own such equipment myself (yet). And a random fact, the microscope is probably a dutch invention. An e...

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