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For 10:1 input compensation, you may require a nominal 5pF capacitor across the 9MW resistance. Bass power amplifier suggestion Do you have a suggestion for a sizeable bass power amplifier in the range of 150-300W (RMS)? I don’t need a preamp as I have a small high-quality head from which I use the line out to drive a large 15-inch (380mm) speaker cab. (J. C. H., Mount Barker, SA) ● You can search our projects on our website at siliconchip.au/Articles/ ContentsSearch A search there reveals a few good options for you: 1kW+ Class-D Amplifier, Pt1 by Allan Linton-Smith (October 2023; siliconchip.au/Series/405) Advertising Index Altronics.................................53-56 Beware! The Loop......................... 6 Dave Thompson........................ 103 DigiKey Electronics....................... 3 Electronex..................................... 7 Emona Instruments.................. IBC Hare & Forbes............................. 19 Icom............................................... 5 Jaycar............................. IFC, 41-44 Keith Rippon Kit Assembly....... 103 LD Electronics........................... 103 LEDsales................................... 103 Microchip Technology.............OBC Mouser Electronics....................... 4 OurPCB Australia........................ 23 PCBWay......................................... 9 PMD Way................................... 103 Silicon Chip Back Issues........... 70 Silicon Chip Binders................ 103 Silicon Chip PDFs on USB......... 95 Silicon Chip Shop.......... 63, 71, 79 Silicon Chip Subscriptions........ 57 The Loudspeaker Kit.com.......... 93 Wagner Electronics..................... 10 104 Silicon Chip 500W Class-D Mono Amplifier by Phil Prosser (April 2023; siliconchip. au/Article/15730) 500W Power Amplifier, Part 1 by John Clarke (April 2022; siliconchip. au/Series/380) New SC200 Audio Amplifier by Nicholas Vinen (January 2017; siliconchip.au/Series/308) Ultra-LD Mk.4 200W RMS Power Amplifier, Pt.1 by Nicholas Vinen (August 2015; siliconchip.au/ Series/289) Ultra-LD Mk.3 200W Amplifier Module by Nicholas Vinen (July 2011; siliconchip.au/Series/286) Studio 350 Power Amplifier Module by Leo Simpson & Peter Smith (January 2004; siliconchip.au/Series/97) Programmable Ignition System queries I have some questions about the Programmable Ignition System from the March-May 2007 issues (siliconchip. au/Series/56). 1. I am presently building the Independent Electronic Boost Control from the Performance Electronics for Cars book, including the Hand Controller. I noticed circuit differences between the Hand Controllers used for that project and the Programmable Ignition System. I would like to use the same Hand Controller for both systems. Can I do that, or do I need to plan on having two Controllers? 2. The car I intend using the Ignition System on has a GM HEI distributor with an onboard coil; all the electronics are under the cap. This unit has no external connections beyond a 12V source, a vacuum source and a connection to an electronic tachometer. None of the six options shown with the ignition system appear to deal with this situation. I don’t think there are any user-­ serviceable parts under the distributor cap, so there are no wires to tap into. Can I use the Programmable Ignition System with my distributor, or would I be better served remaining stock or doing something else? Thank you for your advice and help. (A. M., Fairfax, Virginia, USA) ● The Hand Controller used for the Boost Controller and the Programmable Ignition are essentially the same and can be used interchangeably. The added resistor array is just there to minimise the possibility of corrupted data. The resistors terminate the signal to prevent transmitting or receiving incorrect signal data. The version with the resistor array is preferred, but the original version could still be used. As far as the GE ignition system goes, unless you can access the connections to the trigger or ignition coil primary, it is impossible to make a connection to the Programmable Ignition input. The Programmable Ignition System effectively has to be wired between the trigger source and the ignition coil so that it can advance and retard the spark timing. You could remove the GE ignition and add in a Hall Effect trigger or one of the optical triggers instead. That would allow you to use the Programmable Ignition System. 10-Plus-10 Stereo Amp circuit from EA How good are your Electronics Australia archives? Many years ago, I built (what I am sure) was a version of EA’s “Playmaster” 10 + 10 solid state stereo amplifier. I think it was from the late 1960s, possibly 1968. The amplifier used AD161 & AD162 transistors in the output stages and had a regulated 30V power supply. I am after a copy of the circuit if you can provide it. (P. W., Pukekohe, New Zealand) ● After much searching, we finally found this article: the “10-Plus-10 Stereo Amplifier” design was published in the November 1968 issue of EA, starting on page 44. It was not listed in any of the EA project indexes we have! SC Errata and on-sale data for the next issue Universal Loudspeaker Protector, November 2015: the 6.8kΩ resistor shown below IC1 in Fig.2 should be 5.6kΩ as per the circuit diagram and parts list. It may also be marked on the PCB as 6.8kΩ. Next Issue: the May 2025 issue is due on sale in newsagents by Monday, April 28th. Expect postal delivery of subscription copies in Australia between April 25th and May 15th. Australia's electronics magazine siliconchip.com.au