Even the simplest of Philips portables (the second digit indicates luxory class 0) was equipped with FM around 1980. The power is not switched between AC and DC by the power chord connector, but by separate positions of the ON/OFF switch. This makes the radio a perfect candidate for an experiment to compare transformer versus switched power supplies.
Obtained
12/2017
from Harm Schuring.
Condition
5; bad case, misses antenna.
Disposed
Sold 5/2021.
This Object
The power consumption with the built-in transformer is (off/FM) 0.6/0.8Watt. Though the radio is supposed to be used with 6V batteries (4xAA), the built-in power supply delivers a much higher voltage, namely 10.6V, but the radio also plays well on 5V. On 22 March 2019, I installed a DC jack to compare various power supplies. With a 5V iPad plug charger, consumption is 0.1/0.2W. A brandless USB charger presents the same consumption, but producces disturbing noise. The same happens with a 9V plug switched supply, which measures 0.1/0.4W. The disturbing noise is also present when the volume is turned down, so it is probably originated in the LF section. Appearently, not all switched mode power supplies are equally clean in output, and some may be unsuited to feed radios.
Part of Gerard's Radio Corner.
Generated by SiteBuilder on
26/2/2024
by Gerard
(g.tel@uu.nl)
