I decided to redo my old 1.25kV PMT Bias Power Supply. In particular I wanted the supply to run without a central power supply and added a small transformer and linear regulator so I can run it off mains. I also replaced the TNC connector with two safety 4mm banana connectors. The voltage divider for the multimeter is now on the HV board itself, rather than floating in the air.
Otherwise I reused most of the old components, the old PCB and also the front panel.
Repairing a SE.306.1-2 Power Supply
I recently got this old power supply in an untested condition. It has an unregulated -24V DC output, as well as a regulated -14V output, cumulative 500mA max.
It is not really suitable as a laboratory power supply, as over current protection is done using a fuse on the secondary transformer side. A pretty neat feature however is the overload indicator, if the unregulated voltage rail drops too much it will light up way before there is a risk of the fuse blowing.
Gossen T4 80 1 Capacitor Replacement
I recently got this 80V/1A Gossen (SIEMENS branded) T4-80-1. It was in original condition and some of the capacitors did not look quite so good.
Cable grommet The rubber cable grommet started to become oil after all these years, so I cut it out and replaced it with a new one after cleaning the mess up.
Inside Look Some picture of the inside, I really like the manually wire wound power resistors.
Flugaustellung P Junior
All pictures taken with my Sony SLT-a77 with a Sony DT 18-55mm F3.5-5.6 SAM.
Unfortunately it was raining during my visit.
La Gravière du Fort 07.10.2023
All of the following pictures were taken with a GoPro 7.
Unfortunately the water was quite cloudy.
Naturwildpark Freisen October 2023
All pictures taken with my Sony SLT-a77 with a Tamron SP AF 70-300 F/4-5.6 Di VC USD and Sony DT 18-55mm F3.5-5.6 SAM.
Microscopy Cold Light Source Slow-Start/Preheat Circuit
I have this older soviet microscopy cold light/fibre optics source “ОБ” for MБС-10 microscopes. In order to increase the life of the 12V 75W halogen lamp inside I wanted a slow start circuit that first limits the current through the bulb such that the latter can preheat a bit before it goes over to full power. To accomplish this I built a simple NE555 timer circuit that switches a relay that bridges out a 2R7 power resistor that limits the current through the bulb.
230V Phase Angle Control Dimmer
A fairly simple phase angle control dimmer using a triac, diac, resistor, potentiometer and a capacitor. For noise suppression I added an inductor and a filter capacitor.
Arduino Traffic Light Controller
Fairly simple traffic light controller I built the other day. It consists of 5x relays switched using a ULN2803 darlington array with free wheeling diodes from an Arduino. Two digital inputs are also available to hook buttons up. 12V/DC power is supplied using a 230V/AC PCB SMPS module.
Not too much to say about it really.
Teufelsburg (Saarland)
All pictures taken with my Sony SLT-a77 with a Sony DT 18-55mm F3.5-5.6 SAM and Tamron SP AF 70-300 F/4-5.6 Di VC USD objective.